伦敦是世界金融中心之一，绝大部分刷卡即可。 英国一般不需要付小费
以下见Tripadvisor：
Fast food, cafes and coffee shops
No tips are ever offered in fast food restaurants.
In a cafe, you may receive waitress service to bring your tea, coffee or whatever you have ordered to the table. In these establishments tipping is usual. If you feel the service has been especially pleasant then a tip of 10% would be appropriate. Similar to a restaurant but only in table service cases. .
In coffee shops, such as Starbucks, there may be a tip jar on the counter, but very few customers offer tips.
In casual cafeterias, where you collect your food and place it on a tray, commonly found in tourist attractions, tipping is never appropriate.
Restaurants
In casual restaurants, where you pay for your order at a counter, but food is brought to your table, tipping is uncommon. You are welcome to leave a pound or two if you wish.
In restaurants where you place your order with your waiter/waitress and receive food, and your bill, at your table, should you wish to tip, 10% is generally the maximum. The expectation does vary from place to place - in fine dining restaurants where you receive personal service, a tip would always be expected (while never compulsory, it would be considered rude unless there was a problem with the service), whereas in the most casual of restaurants tipping is not universal.
If you have been unhappy with the service, you should not leave a tip.

入境不会问太复杂，实话实说就可以。
十天带现金200磅不多，随便一个简单套餐就是十几磅。当然很多时候可以刷卡。
小费问题有点复杂。很多旅游攻略说英国小费不是必须。我遇到的情况是这样：正式的餐厅，很多在账单末尾会写上建议给服务员12.5%的小费，虽然是建议，不是强制，但是入乡随俗，我个人是给的。如果用信用卡，你可以在账单上写上金额，如果现金，就额外放上小费的金额就可以。还有一些餐厅，比如我去的一家比较正式的中餐厅，账单里直接写明包括12.5%小费，这就是必须的，你也不用额外纠结。正式餐厅因为有服务员为你服务，所以小费也是合理的。快餐厅没有小费问题。出租车，可以不给，司机是所有零头都找给你的，不像有些国家出租车司机是不找零的，算小费了。不过，如果你把零头给司机，司机会更热情地帮你提行李，留下联系电话，你需要就直接打电话都OK。

1、 通常不会问什么。被问了就如实说。你报团总有凭证或记录的吧，该团总有行程说明吧，有这些就行了。
2、可以。应该够，但是也不建议再减了。
3、英国一般不用
4、带现金比你满街找地儿取钱要方便得多
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基本用不到现金，我刚去了一个月回来，带了300磅，只用掉100。大部分地方都可以刷卡，但一定要准备芯片卡，很多地方pos机刷磁条卡不能识别。至于小费，看心情，大多数情况不用给，其实我以前在餐厅打工的时候英国本地人也是不给居多的

多准备点小额钞票和硬币，伦敦火车站的厕所都要投币，乘坐出租车要给纸币，酒店服务员给你提行李到房间每件1英镑，每天早上出门离开酒店在桌上放2英镑小费，餐厅吃饭一般要给小费，唐人街很多餐馆的小费是打入账单的，这种情况就不要再给了。

如果你有visa芯片卡可以不用带现金，入境会问你的行程如实回答即可

入境时如实回答就可以了。
现金的话200真的足够了，主要是应付路边想买小玩意儿或者上厕所。