Garry might be a grumpy barstard but he makes brilliant covers.   I have towed my boat up and back to Denham with the cover on .....very heavy duty canvas that fits like a glove.   it is now five years old and still going strong. No he isn't cheap but I defy anyone onto find a better made one. 

Gary makes a great cover on my second one now. First one lasted 10+ years and on the boat all the time. Also towed with it plenty of times up north and down south.
Last time a caught up with home last year he was talking of giving up the trimming and retiring. Hope this is not the case as he is great at what he does.