Rercommend a London show

My partner and I have been invited to a wedding anniversary Sunday luncheon in London, in early December. We do not get to London very often. He asked me if I wanted to go and perhaps see a show on the Saturday. This is a rare treat so I want to see something memorable. What do you recommend? The last time we went to London we saw Billy Elliot. Oh and we saw War Horse in Salford.