How to spend 17 hours in London

If I had arrived in London five hours earlier, my night would have been completely different. I would have put my luggage into storage as previously described, but when I stepped out of the train station, my eyes would fall upon the big poster covering the side of a nearby building, advertising the contents.
I would have had plenty of times to go and see Wicked. I would have been a cultured person. Instead of a homeless one.