Okay, hear me out. If you live in Greenwich or somewhere nearby, you can just walk. There’s a lovely riverside path. It takes you past the Cutty Sark and the naval college.
You’ll feel smug. You’ll save money. You’ll work off the overpriced pint you’re about to drink. It’s a win-win. But don’t walk from central London. That’s a two-hour hike. You’ll miss the support act.