Hatter,
Have you visited ScotlandsPeople at:
http://www.scotlandspeople.gov.ukIt is a pay per view site but might yield the information you are seeking.
However, online marriages only go up to 1929 and online deaths to 1954 - you may well be looking for later dates. Later records can be viewed in person at New Register House in Edinburgh.
There is a free surname search on the Home Page of ScotlandsPeople.
I checked the two spellings you give from 1908 (assuming that, as Mary Catherine was born in Darlington in 1908, you would not wish to look earlier than that). There were no marriages under either spelling and only 2 deaths under each. Narrowing the year range yielded the following:
BEDINGFIELD
1 death in 1931
1 death in 1948
BEDDINGFIELD
1 death in 1928
1 death in 1943
It might be worth 6 pounds to check them out? Incidentally, wildcards are possible so you can search for BED*INGFIELD
Judy