I've been looking to get an indoor cover for my TCS for the winter whilst I do a engine rebuild, but haven't been able to find one that is the right shape, as well as the ridiculous price some of them charge, without admitting that they aren't correct, but are actually an S2 shape. However, after a bit more looking around I found this site in Germany. As they didn't actually do one for our cars, these sizes were for a Mazda MX5 and apart from the height, were within an inch or two.
https://www.walser-shop.co.ukAfter a bit of checking and correspondence I decided to go ahead and order one of their
Car cover Indoor Stretch Plus size M black Article no.: 41050
This arrived today and I must say it looks and feels just the job. Soft, stretchy and less than £100 (as opposed to several hundred pounds quoted by a couple of companies).
Naturally, I have no connection with this company etc, etc. Just wanted to pass on this for anyone that might be interested.