Grahamp,
With regards F-type specific car covers, I specified the following custom cover for my 2016 V6S Coupe Manual from new, so i have had it since July 2016 and it is still in great condition and working well.
It fits it very well and is a full lined outdoor stormshield cover, which works well to protect paint from sunlight, tree sap etc, bird droppings, dust and the like. It fits snugly over the wing mirrors and has an elasticated base, plus some clip straps at points that go right under the car, to stop wind getting hold of it. The inside is soft lined. They are a little pricey but very much worth the investment to protect the cars condition. The car is under this cover during the summer months but back in a dry garage through the winter it is a heavier thickness of cover than the usual or indoor ones.
https://www.specialisedcovers.com/car-covers#outdoor-covers