Philip, if you keep an eye on eBay, Ferrari covers come up fairly frequently. Just type 'Ferrari indoor cover' in your search and you'll get to see what's on offer. About 18 months ago, I bought a nice soft cotton indoor Ferrari cover, red with a silver/grey Ferrari logo on the bonnet for £85 + P&P. It was originally for a 355, but it fits a 328 perfectly, it even has 'ears' for the wing mirrors. A similar type should be Ok for your 308.
If you want to spend £200 you can get a brand new tailored cover if you look in the small adverts at the back of car magazines.
The alternative is a polythene bubble that you drive the car into in your garage, they even have built in fans and dehimidifiers. I think they start at about £500. I might be tempted to buy one next year.
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