I'm going to London, England 15 days in winter vacation.

Free wifi? Well, there are some in airports and other places, such as cafes and fast food restaurants, but you have to spend money there to use wifi. In fact, the local packet traffic is not expensive, giffgaff card, 12 = 120 RMB. A month, local calls can be made for 300 minutes, and the traffic is 30GB. As long as you don't find it, the traffic is actually unlimited. Anyway, you're only half a month. It's okay.

Clothes are on sale at Christmas, which is very cheap. You can take two sets of clothes, a coat and a pair of jeans, and you can buy the rest. You came to London to play. If you smoke, bring cigarettes (generally speaking, you can only bring 100 cigarettes and 50 cigars in Britain, but you can put them in your carry-on bag because you have a tourist visa). You can't get used to smoking in Britain, but it's more expensive. As for the rest, you can buy them locally. Then stay in a hotel, usually 100~200, and a better hotel is 200+. You can make a reservation in China. Finally, if you are a backpacker, remember to buy an oyster card in London, which is a kind of transportation card for London bus, subway and light rail. It is sold in general convenience stores and can be recharged directly in convenience stores. If you are not used to the local food in London, you can try it in China and eat some special dishes. Oh, only fish &; French fries are a British specialty. Uh, it's greasy. Generally don't eat. You can still try it if you come to play. That's about all you can think of. If you have any questions, please ask again. Anyway, in London, you just ask.