Stuart
The advice I took was from an Avon representative on their stand at the NEC quite a few years ago. The rear tyre needs replacing, the tread is fine but the side wall is definitely doubtful. Whilst noting what you said, when I make that move I shall be sure to ask the required questions. As I said in the original post some of the problem was possibly caused by the lack of confidence on what was the first ride for many years and far improved on the second. Hopefully the rides and confidence will mill get longer and better over the next few weeks. Weather permitting.
Den
Ps. The actual pressure I used is currently at 23 front 24 rear.