Thanks everyone for your input, as I say the indirect link to the seller, and the seller himself are in delicate positions, however I have made some progress.
The mill is available including the head and other tooling mentioned plus other bits and pieces for £2,000 which is more than the numbers suggested above.
Whilst I’m not trying to influence the gratefully received opinions, I can categorically guarantee it has had very little use and the use it has had has been light duty whilst also being taken care of by a meticulous owner. It is dirty through lack of use only.
The sensitivities remain and a counter offer is not possible, nor willingly facilitated by the contact chain so this is a taker it or leave it situation.
It sounds like it is not worth that much. If that is the case, where am I best looking and what am I best looking for, in order to replicate the same capability, quality and guaranteed condition / wear / tooling for £1,500? I’m not as familiar with mills as I am lathes (which isn’t much) so will need some guidance. Last thing I want is to buy something that is worn out, not working as it should or in some other way ‘for sale for a reason’.
Appreciate the help so far.