给大家一个福利，其实我们的信一大堆，要12个来源都有，但是因为很多人有疑惑，我来贴一下原文。
所有的信件是要来自3个来源就可以了，不是说每个都必须不一样啦。比如说联名的话，可以提供水电2个、煤气2个、council bill2个就足够了，不需要提供六个都不一样的。
You must provide at least 6 items of correspondence, addressed to you and your partner jointly or in both your names. The dates of the items of correspondence should be spread evenly over the whole 2 years. They should be from at least 3 different sources. If you do not have enough items in your joint names, you may also provide items addressed to each of you individually if they show the same address for both of you. For example - 4 items of correspondence in joint names to the same address and 2 items addressed to each partner at the address. In total 8 items would need to be submitted. If you and your partner have no bills or correspondence in joint names, you will need to submit 12 items (6 each) of correspondence evidencing that you reside together at the same address.
这个是从我的申请过程中的表格里面copy过来的，非常准确。