Several of the ABS lads get covers from a company called Specilised car covers. They are not cheap but are tailered to the car, not a generic size. There are several LC,s that live outside all the time under these. One bloke has had to replace his after 8 years but mainly due to the neighbours cat using one corner as a scratching post, causing it to end up shreaded
Keith ABS
Just done a quote on that web site for specific car with no add ons and its £289 for the car cover . Like you say not cheap but quality .
Just noticed when I just dropped the missus off for work that Lidl have / are getting some in 
No idea the size or quality but it would keep the worst off it when the weather is bad
Will keep an eye out for that

I think a cover does more harm than good
the wind blows and they flap against the car scratching the paint,they trap moisture, etc.
the only good one ive seen had a alloy canterlever frame inside you lifted off from the back of the car and it folded up,you then drove onto it the front wheels on the frame then pulled it back over the car.as the cover didn't touch the car no damage and a air gap so no trouble with moisture
Have seen those but cant recall where now , dont seem to be any on the bay

Have seen a few car canopy frame tent things that look good for about £150 and they can be fixed to the ground securely . To stop the cats clawing at it can put grease or something on the uprights
Plus it will be at the side of the house , enclosed by fence .
This is just an example :
