Glass's just do the old trick of sticking £500 premium on top of anything called a 'limited edition'.. on a genuine limited run car they have no data as dealers don't sell enough of them to collate accurate info. Out of 900 theoretical cars, I'll bet less than 5% have been sold through a registered dealer in the last 12 months.
A good example (and in no way comparing mine to a CSL before you ask) from their site:
BMW 3 Series M3 CSL
3.2 Petrol 2-door Coupe
6 Speed Sequential Rear Wheel Drive
Year: 2003 53
Mileage: 30,000
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Excellent condition:
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£22250
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Average condition:
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£19900
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Below average condition:
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£17700
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Think you can find one for a little over book price?
EDIT - I do accept your point DC about a deflated market, but this is true of thirsty petrols that attract high road fund licence. Diesels are pretty much stable and If I was looking to buy one then something nice, quick, capable of doing 50mpg and costing £115 a year to tax would be on my list... the benefit of there only being another 299 cars exactly the same as it in the UK ensure residuals stay high.
Granted, to the lay man wanting a diesel Golf, then they make no sense at all... those wanting to pay a premium to have an Anniversary do so because they want one and the fact they're fishing in a small pool dictates prices.
Mine's white and has some stuff.