Au Pair
If you like kids, there are loads of loaded people in London who need theirs taken care of. There are lots of jobs and, though experience dealing with kids will help you get the good ones, it's not necessarily always required.

Au pairing can be pretty cushy and lucrative with some live-in jobs paying £300 cash in hand and maybe even providing a car for you to use. Others though might not be so good with low pay, demanding parents, and lots of hours. If you've got the experience and references, shop around awhile for something that suits your needs.