Now I got why Royal Mail was sued. I am going to do the same. I had a Po box and then I let the renewal lapse because I did not need it. 4 months later I decided I needed a Po Box again. I called up and said I had one po box and I did not pay for the renewal, and asked if i needed to reapply or could have the same Po number. They said yes same po number. The payment was for 6 month po box service. However only 2 months later from my payment date, they told me I have to pay again to use it! What?? It turns out they backdated my payment to cover the previous 4 months when i did not use their service (there was no contract), without telling me. Dodgy. It is like "you gotta pay us the period you didn't use our service in order to buy our service for future use". Disgusting.