what about a letter from a DOCTOR? plus, national insurance, and everyone gets a P60 each April whether you are employed or unemployed. The tax office will have been in touch too, I know my son is 25 and not working claiming jobseekers, but he has letters from them every few months giving changes in benefit, it pays to keep things, though telling you that now is no help. but surely he was on the electoral roll, what about getting one of those credit reports based on addresses, they are cheap and list the length of time a person has been at an address.