Also I was told at immigrations that I have to keep my passport and flight permit at-hand incase I get stopped by an officer for being a minor. Is this true? The flight permit is a hard-as-forget paper to get a duplicate of if I lose it. I need it for a few months but my sister needs it for a few more years and this one paper authorizes both of us.
Not yet, I was going to have it for dinner. I'm currently at the underground and boy I can't believe that BA's subway is better with regards to allowing passengers to move from cart to cart mid-transit, wider carts (it's crammed here with my luggage), and it looks like a tube with doors. Not like a train, lol. But anyways, minor details. It's loving fast, I can tell you that and it's impressive how spread-out the stations are.
Keep your passport on you at all times, but somewhere safe.
You're not likely to be stopped randomly without cause (police actually need reasonable suspicion to do searches or stops), but if you are, you will need to be able to prove you are in the country legally.
No idea about flight permits. Just keep it safe.
London is a pretty decent location, but just follow the rules of being in a foreign city. Keep your important items close, preferably in your front pockets, and be aware of people around you.
You will stick out as a tourist.
The tube isn't too uncomfortable, I don't find. But yeah, it's weird that it's got completely open doors carriages.
And it does get round very quickly. It's a pretty damn good system, with how quickly you can get all over London. Far quicker than if you were to try driving, or bussing, or walking.
If you get Fish and Chips, get curry sauce!
It might vary from place to place, but there's quite a common curry sauce that chippies have, which I assume is a wholesale item they all get from the same place, and it's lovely!