We really don't need to see debt collector letters. I said this in my previous post:
Debt collectors can be safely ignored. They cannot send round "bailiffs" and they cannot get a "CCJ". They cannot do anything. Never, ever, ever, ever, communicate with a useless debt collector. Just ignore them. They will eventually give up.
If/when you ever receive a Letter of Claim (LoC), then you can show us and we will advise further.