I got this information from the following site. It starts with the marriage of John Collomosse. Perhaps you can contact the district where he was married and the certificate may tell you where in Italy he came from. I posted all the items that came up (hope it's not overkill).
www.freebmd.org.uk/cgi/search.pl
If you are SURE that our transcription(s) below differs from the GRO index, you can submit a correction request by clicking on the Info button to the right of the entry in question.
Surname First name(s) Age District Vol Page
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Marriages Sep 1852 (>99%)
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COLLOMOSSE John Dewsbury 9b 701
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Births Sep 1863 (>99%)
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COLLOMOSSE Emma Dewsbury 9b 555
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Births Mar 1868 (>99%)
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Collomosse Elizabeth Dewsbury 9b 656
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Births Mar 1870 (>99%)
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COLLOMOSSE Alan Dewsbury 9b 660
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Births Sep 1872 (>99%)
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Collomosse William Henry Dewsbury 9b 696
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Marriages Dec 1872 (>99%)
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COLLOMOSSE John Dewsbury 9b 1074
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Births Mar 1873 (>99%)
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COLLOMOSSE Walter Dewsbury 9b 725
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Births Mar 1875 (>99%)
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Collomosse Amy Dewsbury 9b 704
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Marriages Mar 1876 (>99%)
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Collomosse Joseph Dewsbury 9b 878
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Births Jun 1876 (>99%)
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Collomosse Martha Dewsbury 9b 798
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Deaths Jun 1877 (>99%)
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COLLOMOSSE Eva 0 Dewsbury 9b 463
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Births Sep 1877 (>99%)
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Collomosse Roland Dewsbury 9b 770
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Births Dec 1877 (>99%)
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COLLOMOSSE Alice Dewsbury 9b 778
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Marriages Dec 1884 (>99%)
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Collomosse James Dewsbury 9b 1007
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Marriages Sep 1885 (>99%)
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COLLOMOSSE Elizabeth Dewsbury 9b 908
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Births Dec 1885 (>99%)
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Collomosse Herbert Dewsbury 9b 697
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Births Mar 1886 (>99%)
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COLLOMOSSE Greenwood Dewsbury 9b 716
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Marriages Dec 1886 (>99%)
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COLLOMOSSE Emma Dewsbury 9b 1035
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Births Dec 1887 (>99%)
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Collomosse Harry Dewsbury 9b 690
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Births Dec 1889 (>99%)
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Collomosse Bingley Dewsbury 9b 691
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Marriages Dec 1889 (>99%)
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Collomosse Allan Dewsbury 9b 1095
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Deaths Sep 1890 (>99%)
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Collomosse Elizabeth 55 Dewsbury 9b 437
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Marriages Dec 1890 (>99%)
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Collomosse Jane Dewsbury 9b 1167
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Births Jun 1891 (>99%)
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Collomosse Walter Dewsbury 9b 768
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Births Sep 1892 (>99%)
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Collomosse Ethel Dewsbury 9b 731
Collomosse Laura Dewsbury 9b 734
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Births Dec 1892 (>99%)
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Collomosse Janie Dewsbury 9b 706
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Births Sep 1894 (>99%)
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Collomosse Eva Dewsbury 9b 682
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Marriages Sep 1896 (>99%)
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COLLOMOSSE William Henry Dewsbury 9b 1195
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Marriages Dec 1896 (>99%)
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Collomosse Martha Dewsbury 9b 1200
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Deaths Mar 1897 (>99%)
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Collomosse Eva 2 Dewsbury 9b 478
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Births Sep 1897 (>99%)
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Collomosse Ada Dewsbury 9b 723
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Births Dec 1897 (>99%)
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Collomosse Edith Dewsbury 9b 688
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Births Dec 1899 (>99%)
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Collomosse Friend Dewsbury 9b 669
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Births Mar 1900 (>99%)
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Collomosse Clara Dewsbury 9b 706
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Births Jun 1902 (>99%)
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COLLOMOSSE Leonard Dewsbury 9b 708
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Marriages Dec 1902 (>99%)
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Collomosse Amy Dewsbury 9b 1201
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Deaths Mar 1903 (>99%)
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Collomosse John 74 Dewsbury 9b 439
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Births Sep 1903 (>99%)
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Collomosse Bertha Dewsbury 9b 701
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Marriages Sep 1904 (>99%)
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COLLOMOSSE Alice Dewsbury 9b 1417
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Births Jun 1907 (>99%)
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COLLOMOSSE Ellen Southampton 2c 647
COLLOMOSSE Ellen Dewsbury 9b 647
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Marriages Sep 1907 (>99%)
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COLLOMOSSE Herbert Dewsbury 9b 1469
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Marriages Jun 1908 (>99%)
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COLLOMOSSE Walter Chorlton 8c 1570
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Births Sep 1908 (>99%)
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Collomosse Lily Dewsbury 9b 629
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Births Mar 1909 (>99%)
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Collomosse Allen Dewsbury 9b 598
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Deaths Mar 1909 (>99%)
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COLLOMOSSE Allen 39 Dewsbury 9b 506
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Births Sep 1910 (99%)
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COLLOMOSSE Mary Dewsbury 9b 600
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Births Mar 1911 (>99%)
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Collomosse John Dewsbury 9b 591
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Marriages Mar 1911 (>99%)
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Collomosse Willie Dewsbury 9b 774
Surname First name(s) Mother/Spouse/Age District Vol Page
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Marriages Jun 1912 (>99%)
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Collomosse Henry Dobson Dewsbury 9b 1281
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Births Sep 1912 (>99%)
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COLLOMOSSE Alice Wilcok Dewsbury 9b 1000
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Deaths Jun 1913 (>99%)
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Collomosse Ethel 21 Dewsbury 9b 800
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Deaths Dec 1913 (>99%)
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Collomosse Ellen 6 Dewsbury 9b 748
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Births Mar 1914 (>99%)
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COLLOMOSSE Elsie Dobson Dewsbury 9b 1187
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Marriages Dec 1916 (>99%)
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Collomosse Janey Almond Dewsbury 9b 1117
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Births Mar 1917 (>99%)
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Collomosse George Wilcock Dewsbury 9b 855
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Marriages Sep 1917 (97%)
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Collomosse Ernest Powell Cheadle 6b 515
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Marriages Mar 1919 (>99%)
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Collomosse Edith Wood Dewsbury 9b 1000
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Deaths Jun 1919 (93%)
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COLLOMOSSE Lydia 68 Dewsbury 9b 712
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Deaths Mar 1922 (>99%)
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Collomosse Mary A 51 Dewsbury 9b 927
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Births Dec 1922 (99%)
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Collomosse Madge Wroe Dewsbury 9b 968
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Marriages Jun 1924 (>99%)
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Collomosse Clara Fenton Dewsbury 9b 1531
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Deaths Sep 1926 (98%)
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Collomosse Joseph 70 Dewsbury 9b 557
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Marriages Mar 1928 (86%)
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COLLOMOSSE Friend Hunt Barnsley 9c 301
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Marriages Mar 1929 (>99%)
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Collomosse Allen Hinchliffe Dewsbury 9b 943
Collomosse Mary Collier Dewsbury 9b 932
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Marriages Mar 1930 (98%)
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Collomosse Bertha Kilburn Dewsbury 9b 733
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Births Jun 1930 (>99%)
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Collomosse Dennis Hunt Dewsbury 9b 880
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Births Dec 1933 (26%)
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Collomosse Walter Hinchcliffe Dewsbury 9b 687