So wen't to local parts dept and asked for a good quality one. So Steve gave me a £20 plastic OE quality one which went on like a glove.
First Line FCB 2360 CV Joint Boot Kit.
Mot tester said it looked good. Hopefully it'll last the rest of the life of the car
Just thought I'd let folks know they are available aftermarket
Edit: Should have mentioned it's a 2007 C4 1.6hdi. But I suspect if you ask your parts guy fr First Line Boot Kit to suit he/she will find one to suit your model....