Thanks everyone for you constructive replies, it has helped enormously! Will have a think further about it, and chat with hubby further - we have to be 100% sure regardless of how my boss feels about things!
Am thinking most people at my work wouldn't really care, it's just my boss. Tossing up the possibility of a transfer before I go back, whether we have number 3 or not I don't really want to work for a boss I don't like or respect so figure either way it's a way to improve my work situation
Thanks again for all your help and good luck to those of you on maternity leave/s