I really feel that the price will depend on the buyer. I know there are dealers around who will strip the rolling stock and buildings etc and destroy the layout so that they can make loadsofmoney. I do not want that. Each of the locos represents around £100, Coaches are £20ish, Trucks are £5-6, Houses are the same. But that does not represent what I want to do.
That is why I say, come and look. I do have photos but do not know how to include them, (could send them by e-mail if anyone is sufficiently interested, but one still needs to see it, if only to make an assessment of the extraction from the roof room!