Does anybody here have any idea what the current prices are in the UK for an old Jones Swan Neck machine please?

I've not seen it in person yet, only a picture.  It is VERY dirty so I can't see the condition of the decals.  Also the owner hasn't seen it herself recently, so doesn't know if it has a shuttle & bobbin with it or not.

All I'm really looking for is a rough ball park figure if anybody can help me?

Many thanks in advance.