Gary,
Thanks so much for going to the trouble to look for my Alexander and Elizabeth. Unfortunately, I'm pretty sure this is not them.

I have no evidence that they were still in Aberdeen after the 1841 census, but Alexander was getting on a bit (supposedly 70 in 1841) and they'd lived there for a good few years. I think it's possible that he had died by the 1851 census and Elizabeth (45 in 1841), if she was still with us, may have moved on, remarried etc etc!
I don't even know for sure where Alexander was born - just NOT in Aberdeenshire as per 1841 census return.However, I'm pretty sure it was in Marnoch, Banffshire. Elizabeth WAS born in Aberdeenshire.
Thank you for trying! It's appreciated.
Jill