Hi Debi,
You could try
FreeBMD.
Quick search there for Henry Hornby 1900 to 1910 yielded the following:
Marriages Dec 1900
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   Hornby Henry   Birkenhead 8a 939 Â
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Marriages Jun 1901
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   Hornby Henry   W.Derby 8b 1044 Â
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Marriages Dec 1901
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   Hornby Henry Boydon   Birkenhead 8a 837 Â
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Marriages Sep 1907
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   HORNBY Henry   Bolton 8c 896 Â
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Marriages Mar 1908
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   HORNBY Henry   Berwick 10b 662 Â
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Marriages Sep 1910
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   Hornby Henry   Chorley 8e 1203 Â
*********************************************
Unfortuantely none of these yielded a marriage to a MARTHA. (
You can find this by either entering the christian name of the spouse, or as I have done by doing the search then clicking the VOL/PAGE to goto the results showing (Normally!) 2 men and 2 women).
So I expanded the search to include 1890 to 1910 which threw up a marriage in 1895 to a MARTHA SHORROCK
HERE.
Marriages Jun 1895
Surname First name(s)  District Vol PageÂ
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Eatough  Lydia       Blackburn 8e 732 Â
Fairhurst Townley     Blackburn 8e 732 Â
Hornby   Henry      Blackburn 8e 732 Â
Shorrock Martha      Blackburn 8e 732
Hopefully this is the correct person. If you believe it is, You will need to get a copy of the marriage certificate either at the registry office in Blackburn
HERE or online
HERE
Let us know how you get on please,
All the best, :wink:
Dave