Witham's have the main contract with the military / gov to sell off their surplus equipment, they've been in operation for donkies years and have a 700 - 1000 item auction every month or two, then general auctions and sales running the whole year round.
Nearly everything goes for way more than it is worth, except the odd brand new D4 / RR - which is for export outside of the EU only
I was told by a guy who is an Army mechanic, that they are trialling the G-Wagon
And that there are large reserve stocks of low mileage mint Defenders that will be sold in the near future. He said a lot of them are "TD5 but with 300tdi engines" Do they change the engine??
The army carried on using the 300tdi after the TD5 came in, they had concerns over the ECU sheilding, and in feild servicing, so the ex mil ones are TD5 bodies, interior etc, but still with the 300TDI fitted.
Then only exMOD proper TD5s out there were for civvy use, or some that stayed on UK bases.