Hello Andy,
You don't mention any chucks, nor could I spot any in the pictures. It looks to be in fair condition but most buyers will want to look it over throughly and check for play, wear etc.Does it run?
I think she should be able to get a price better than £500, certainly I wouldn't expect to get it for less. There also seems to be a vertical stand of some kind [for threading perhaps] and possibly other things you haven't shown, they could make up the package for a really hard-nosed haggler.
Try offering it at £750 to see how it goes and suggest that she plays hard to please with frowning and sucking her breath in through her teeth like the proverbial plumber/electrcian!
Brian