Written by John Kruse, one of the leading experts on Bailiff Law, this consumer friendly guide is essential reading for anyone who comes into contact with a bailiff.
The book is easy to understand and clearly explains the rights
a bailiff has, and also what they cannot do when collecting debts and repossessing goods etc.
So send it again, NOT recorded delivery. Instead, go to the PO and ask for a Certificate of Posting (which is free). You don't have to prove it arrived, you only have to prove you sent it.
What happened to your cheque? Was it cashed? If it was, there's your proof anyway.
Apologies to people who I was in the process of helping, I may be gone some time.