One thing to consider is that you can stay in the game way longer than you probably imagine right now. As long as you take care of your body and don't get bogged down in the weight gain, diabetes, metabolic syndrome spiral you can maintain most of your energy into your 30's and even 40's.
Congrats on the job. Everyone has to earn their living somehow. You can always quit after a year or two, or go on a work sabbatical and get out of cubicle land for a while. You just need to think how to frame it so you don't piss people off and burn bridges. As you no doubt know London is a great location for people who are looking for professional contract positions. Do a 6 month contract in the city. Go travel the world for 9 months, Come back and do 12 month contract. Go travel again. Great lifestyle as far as I'm concerned.
Congrats on the job. Everyone has to earn their living somehow. You can always quit after a year or two, or go on a work sabbatical and get out of cubicle land for a while. You just need to think how to frame it so you don't piss people off and burn bridges. As you no doubt know London is a great location for people who are looking for professional contract positions. Do a 6 month contract in the city. Go travel the world for 9 months, Come back and do 12 month contract. Go travel again. Great lifestyle as far as I'm concerned.