Righto I just found the marriage. In case it helps, it’s Partick not Patrick.
The marriage is on Scotland’s People, so if you register, and buy some credits you can buy the certificate - instant download - will help a lot as there are likely to be several Alexander Bells.
The 1911 census can be searched on Scotlands People too - you will need to use credits to view it.
There are many COLQUHOUN and BELL families on the censuses.