贸易签证的代码是什么？
1. 什么是贸易签证？ 在英国，“trading”指以商业为生的活动(business)， 而"trade”(n)则指任何商品或服务买卖的活动， 所以在这里我们一般用 "doing business in the UK" 的概念取代 "getting a trade visa for the UK"的概念。 2. 为什么需要办这个？ 因为有些人的工作本身是商业性质（比如公司老板、高管）或者是来英国进行商务活动的（比如来英国谈生意/开会议的），那为了合法地在英国逗留，就需要申请相应的签证了。而目前能符合这种要求的签证有：
3. 哪一种适合我呢？ 这三种签证类型都有自己对应的申请条件以及适用情况，要具体分析题主的情况才能定夺哦！
4. 如何准备材料？ 根据上面提到的不同需求，所需的申请材料也不一样哈~ 我们这里主要来讲讲Tier 1 investor签证所需要的文件材料~ T1 Investor visas are issued to people who want to come and live permanently in England， Scotland or Wales – they're not available for Northern Ireland residents. People with this kind of visa can stay and work anywhere in the country. You have to meet all of these requirements： You must be at least 18 years old， unless you’re coming into the UK as a child survivor of the Holocaust——in which case you should be aged between 75 and 85 ——and prove that：
a) your financial background is above board; b) you plan on investing £2 million into the UK economy. Of this money， a minimum of £750 thousand has to go towards purchasing 'government bonds'; the rest can be put into shares， commercial property investments or a combination of both depending where an individual wants their investment to lie. This type of bond lasts seven years before it needs to be renewed. The only exception is if you buy government bonds from the National Health Service， which aren't time-limited but are worth less than normal government bonds because NHS bonds pay out interest twice a year rather than once a year (more details here ). If your main residence is outside the EU but within the EEA， then you don't need to purchase these bonds since your residency there counts towards establishing your economic standing. However， any additional properties you may own do still count towards meeting this requirement.
c) show how you intend to support yourself financially while living in the UK——i.e. you will spend no more than half of what you earn whilst in the country， including any income received through rental properties； d) provide proof of legal status wherever you acquired wealth i.e. if it came from legitimate sources such