Update on the silencer.
Managed to find a new one on ebay for £45.00. Unfortunately it's not the clam shell that I originally had, as these seem to be quite scarce at the moment. So I got a cylindrical one that fits perfectly. So before it got too hot outside this morning, I've been and fitted it. Car now sounds nice and quiet again . She might get a service later when it cools down.
We're sitting at 27°c at the moment here in Norfolk.
Regards Andy.