Selling through a dealer

[IROC-Z]

Does anyone know the typical rate of commission a classic or specialist car dealer will charge to sell a car on an individual’s behalf?

I realise the awnser could be "how long is a peice of string?" but I'm talking your average dealer and not someone into selling supercars to footballers.

Thanks

[mr_spock]

I've been asked for £2.5K to sell my GranSport.