Hi Dave
I have a Stormforce Monsoon cover for my Mini when it has to be kept outside. They’re very good quality, waterproof and, most importantly, breathable.
Not cheap but, quality things never are
Cheap covers just hold moisture inside and do your car no good at all.
If I’m using mine for any length of time, even though they’re breathable, I always remove and let some air around the Mini on fine days.
Here’s a link to a Probe cover
https://www.stormcarcovers.co.uk/pro...or-ford-europe