I will try the tricks with the electrical tape. I've also blagged some of the insulating foam strips from work, so I will try that at the weekend.
Thanks again for all your help and suggestyions - it is very much appreciated.
All the best,
No sweat. If you consider your question answered/problem solved, you can select a best answer from the posts so the thread doesn't continue to show as "Unsolved". Good luck!