If it was genuine, why were you the only one to get it, as has been said, I would be careful as to where this came from, maybe even give Motability a call in the morning and ask them and make them aware of it, as it certainly sounds like a scam and if only they had also mentioned the second world war being a factor, we could have known for sure.
Read the FIRST paragraph again there is a clue in there.
Yea Mick, I have read the first paragraph again and I am obviously missing the clue that you have noticed, so would you like to share your observation with me please. If they are sending him a letter because he is about to change his car, then why did the rest of us who are about to change our car not get the same letter.