Hi,
Has the Landy had red in the tank? I.e. would it need a new tank to be driven legally on the roads. Although you point out his has an agricultural ticket so can run red, you fail to mention this restricts people from travelling a maximum of 1.5km on public roads and only between two pieces of land they own. If the tank has had red in it in the past, then it'll need a new tank.
Also, what level of gurantee do you offer on the export to USA option - a lot of Land Rover's have been crushed by the US ports recently as they don't comply to the strict rules - this landy doesn't have the original engine so would be crushed... will you cover the costs for the buyer if this happens?
Cheers,