loooking buy this escort cosworth what she worth bee told 14k +

K reg original 28k 1 ownwer from new full service history
alarm etc
blue top engine well lane turbo covertion 380bhp to prove
in black
leather
standerd wheels
inmaculate paint no scratches origina; onther then the bits done on the engine??
just wanting know the valve and how much to pay as he dosent know what the best price to sel it for any idea pls guy thanks