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Depends how fancy it is. There are doors, and there are DOOOOOORS.
Most doors need some kind of work to make them fit for purpose again.
If you have an inner and outer door on your house then you can afford to have one or other of them both original and be in slightly less than ideal condition, because you have two doors to stop the weather from coming inside.
If you just have one, first would get your frame and surrounding materials thoroughly well prodded. I just discovered a window that I wasn't planning on replacing was held up by completely rotten wood and a single dab of silicon adhesive.Restoring doors properly, most 'front' exterior quality doors from the 1880-1920 period that 'look right' on older houses in 'as found in a skip' condition should go for (when its not you that found it in a skip) £80-400. More than that would suggest its an absolute baller door, or a full on chancer. If its missing hardware, glass and the wood also needs work, keep looking.
BrickMan-
We ended up buying them for a bit less than asking but still significantly overpriced, both way over £400. It was one of those “These are the type of doors we have been looking for, taken a few weeks to find them, how much on top is it worth to us to not have to carry on looking?” decisions. We have builders doing the work so spending weeks looking for the right door at the right price is going to knock everything else out.
brokenbetty
Not an expert, and not in London, but have been browsing a bit and £750 for no glass and still needing a sand/paint or whatever seems quiiiite high!