Thank you all for your replies.
It would appear from the postings that we were not the only ones to suffer this problem. The hotspot delamination problem has occured all over the world. The cause would appear to be a poor bond in the retract opening.
This thread has served it's purpose of alerting others to this probable failure and hopefully prevented unecessary further loss of aircraft.
Iam disappointed that a representative of the manufacturer has not asked to inspect the damage and establish the probable cause.
It is in their own interests to remedy this problem, they would find it hard to protect themselves from litigation should a serious accident occur, bearing in mind this problem appears to be commonplace in their product and is now publicly acknowledged.
If I were selling this product now, I would think it prudent to insist that the manufacturer either fixes the problem or notes in the instructions a warning of the possibility of delamination.
The response that there is nothing wrong with the kit is no longer a defence in law.
Thank you all once again and enjoy safe flying

Mark Diggle