I have a small cockpit storm cover which came with the Roadster, and a large one from John Taylor which fixes with elastic straps. We use the small cover frequently. Easy to fit and weatherproof. I would only use the big one on a clean car so that makes it of limited use. However on a trip to Devon when we got there with a clean car, I used it over a couple if days of heavy rain and it was excellent. But the cockpit cover is 100 times better.
The small cover is Walker St Claire and coincidentally I had a chat to the owners at MOG 16.....
Hello any chance you have is website, i do a round in Google but can't find it