Hi Kate,
I found someone of the same name - perhaps this is your great grandfather's marriage?

http://www.familysearch.org/eng/search/frameset_search.asp?P...

IGI Individual Record FamilySearch™ International Genealogical Index v5.0
British Isles Search Results | Download | Print

James Wilson Robertson Pedigree
Male Family
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Event(s):
Birth: 24 DEC 1886 Glasgow, Lanark, Scotland
Death: 31 DEC 1949 Partick, Glasgow, Lanark, Scotland
Marriages:
Spouse: Margaret Brann Clinton Family
Marriage: 02 SEP 1908 Glasgow, Lanark, Scotland
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Messages:
Record submitted after 1991 by a member of the LDS Church. No additional information is available. Ancestral File may list the same family and the submitter.
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Source Information:
No source information is available.

Cheers,
Christina nee Robertson