Trouble is it sounds like the old guy isn't going to be quite so keen to part with these ones without several portraits of the Queen.
This is difficult to say without sounding like a prize (insert term of abuse here), but I suspect the day is not far away when he won't be around to take anyone's money. I don't recall if the poor bloke had any family, but I reckon when that house in Pangbourne needs to be cleared and sold we may hear from our contact again.