1. Do you have any other correspondance from ever? It would be ideal to have something from the start of your relationship, but any proof is better than none.
2. These are great. Im not sure how the application process goes these days, but when I applied I was advised to send the originals along with photocopies, and ask for my original documents to be returned. They kept the copies but returned originals with my passport and visa.
3. I know it has to say where you work, what you do, when you started, and what your salary is. It should also state any abnormalities, like if your payslips are delivered online. This may not be all of it, so you may want to ask again from others who are better informed.
4. Shouldnt, hopefully. I had a couple of tickets a few years before applying, and even had a suspended license once. And I got in. Definately declare it and offer evidence that you are being forthcoming. I got a copy of my 10 year driving record to send, as well as a written statement. The reason for the statement is that the wording is confusing on the application....or was at least. They ask for any convictions including driving offenses. In the States, 1 minor speeding ticket is not considered a conviction, but it seems to be in the UK. (I think, Im still a little confused about it....) Just make sure he doesnt speed in the UK. There will be enough stress with all your applications to risk anything messing it up.