The most expensive Guinness ever

I just arrived in London, finishing the first half of my 20 hour flight to Beijing. I'm staying one night with my sister, and she's going to make Indian food (yum!) and then we will no doubt stop by a pub. Between flying to London, taking the tube to her husband's work to pick up a key, and then the tube back to her flat, all while hauling a a backpack and a 50 pound rolling suitcase filled with camera gear, this is quite possibly the hardest I've ever worked for a beer. Good thing they serve big pints.