It's amazing how much you can find out by adding and removing search terms though. I've just found out as much about a certain family as I would get from the transcript (apart from unrelated household members and the exact addresses, which aren't important to me in this case).
Using 1891 & 1901 census details as a guide, plus FreeBMD to check for deaths/marriages, I have found one son still in the same place as a boarder, other son working as a footman in London, and father & daughter moved to somewhere in between.
You can put head, daughter, servant, boarder etc in the relationship field, as well as widow, single etc in the keyword field to confirm marital status, and have a guess at occupation.