You need at least 6 letters addressed to you jointly at the same address, the dates should be spread over the total 2 year period. If you cant find letters addressed to you both then you need to show letters addressed to you both individually to show you are both living together.

Just put in the wifes ILR last week and we used the checking service , which although cost £80 was well worth tit, as they make sure your form is completed correctly and do all the photocopying for you.
We also paid by bankers draft to ensure no problems with the payment.

You also need proof of your income over about 3 months or more. We put in wageslips and p60's. Proof of income also provided by at least 3 months worth of Bank Statements. ALL DOCUMENTS MUST BE ORIGINAL,