HI again!
I wonder if LA is right to ask my client to prove,that he was really reside at the rented place,by providing some letters' he might've received on that address, considering that my client has moved from this place 2 years ago and had not really received letters,he would like to keep more than 2 years? Is it not enough prove in the tenancy agreement itself and confirming letter from an ex-Landlord, written twice to LA? And 14-days limit has passed in December,is it going to affect my client?
Thanks for your help and attention.
Erika

The letters would not prove anything particularly after 2 years. I would argue that there should be no need for corroboration in this case and cite R(I)2/51 and R(SB)33/85 to them.

This is a case of the LA sending out further evidence letters in order to avoid making a decision. I would send a JR pre action protocol letter to their legal department as a means of speeding things up.