To me Glass' used to mean something when it was a less commercially available price guide. Now-a-days I take those book valuations by a pinch of salt. I used to have free access to Glass' and on all occasions it always used to give a higher value than even dealer forecourt prices.
I then just used to do research on a similar age/spec car from dealer websites, independent dealers and the likes of Pistonheads / Autotrader. This gave a true ball park on what to aim for.
If you want to do valuations maybe try Whatcars valuations on their website. They are free and not so detailed but in my opinion, they have been pretty much there or thereabouts on forecourt prices and I've managed to get the same part exchange prices listed too on the past 2 cars I've PX'd in. For my old E92, the dealer gave me £200 more than Whatcar's PX valuation and it went on the forecourt for £250 more than the dealer price quoted. I think thats pretty accurate.
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