Not being funny but have you ever seen any cars for sale at the prices quoted in Glasses guide? The only thing that guide is good for is giving you a rough idea of the sort of price a dealer would pay for your car as a part ex.
For a market price, you need to check on ebay, local papers and autotrader to get an idea as to the sort of price people are advertising their cars for. Even then that doesnt tell you what the actual sold prices are.
£14k? Maybe... In the summer when I looked, the prices for 2007 roadsters at garages were £15k -> £16.5k with 25k on the clock. A 2008 should be a faction more, and the lower mileage should also increase its value. The biggest factor will be the time of year like others have said. Last year, from the figures I looked at, the roadsters were worth roughly 15% less over jan2011->march2011 than you would get selling the same car in June/July2011. I think what happens is over winter the roadsters seem to drop to similar prices to the coupe`s, then when its sunny they rise back up again and are more expensive than the coupe`s.
People will still buy in winter as they know they will get the car cheaper. Its just a question of whether you will accept less and a maybe sale now, or wait until summer hoping to get more. Of course, the car may sell easier in spring/summer next year, but by then it will be 2012, and the prices may have dropped a bit more anyway.
People say about the 370`s getting cheaper etc.. but people who want a 350 may not want a 370. I know im one of them.
Roadster prices do not go up in the summer. Almost all cars depreciate.
Roadsters may not depreciate as much as Coupe's in the summer but they still depreciate.
Jamie is selling his car for £14.4k now, in 6 months time the car will be six months older and therefore worth less, not more because it is sunny.
Only high end car prices will fluctate according to seasons.
Anyone telling Jamie to keep it for another six months needs to think about:
6 months road tax: £200 or so
Insurance: £300 for example
Depreciation: £200 a month roughly x 6
Servicing, MOT's and consumables.
Before you know it, it's cost you well over £2k to keep it in the 'hope' that you get a buyer in the spring.....