Thanks very much for the quick reply.
After logging my issue it occurred to me to search for a refurbished or used cylinder assembly. I have ordered one and we'll see how I get on with that. If that fails, I will certainly contact you.
Thanks again.
PS. This is a brilliant forum - I own a number of Dysons and I have friends with Dysons, so it helps to have a go-to place for advice and parts. Much appreciation!