Search Google for Stormforce. I got a luxury one (3 layers) priced at £152.95 + £7.98 carriage by FedEx.
Give them a ring on 01744 633985 quoting 537 (thats for what I requested), or email uksales@cover-zone.com. Ask to speak to John, I dealt with him. Dimensions for the cover were from this site. You might want to ask for the rear of the cover to be slightly longer, to compensate for the spoiler on the car, but mine fits very well, if very snug at the rear. I would put a picture up but I'm about 4000 miles away from my car.
You can get cheaper ones from them as well, depending on what you want. Recommended company.