If you're keeping your car outside, you'll need to get a cover that is not only waterproof but also breathable to prevent the paintwork deteriorating. Hamilton Classic does a good range (www.hamiltonclassic.co.uk) and offers 30 different sizes - expect to pay about £175. If you want to go for a fitted cover it's going to cost you a bit more. Remember you'll need to clean the car every time you put the cover on it. And some car covers aren't rated for high winds (or will need an additional locking strap). You'll also need to keep an eye on on the cover and disperse any heavy rain or snow that builds up on it. Finally, the cover itself will need cleaning so check that you can either wash the cover while it's the car or that you have access to a suitably sized washing machine.