I live in Wandsworth. Services are pretty good actually, and I love it here. The river, lots and lots of green spaces ... Population is high (more tower blocks every day which I don't love so much) and there are many many tax payers, that will be most of it. The Council presumably has significant reserves as well. As someone says, Westminster and Greenwich are similar. All that said, I'd personally be happy to pay more, especially towards social care and schools.