Mazda CX-5 2012

Selling my mazda cx5 as a whole, apparently a blocked thermostat caused the headgasket to go, the car has passed the nct every year ive had it with absolutely nothing flagged or need replacing, which is worse having to sell it over this issue now, Its the upgraded model Leather electric heated seats, Reverse camera Sat nav Drive Adaptive lights Bose speaker sound system Parking sensors around 19" alloy wheels Brand new start/stop battery only put in 3 months ago Only fully serviced 2 months ago with brakes and discs all around, This car has lots of value for some who is able to fix this issue themselves, we have 3 cars in our house so its time to sieze down Car is really clean, Interior is spotless, Whoever comes to see it will take it home, Car is driving and starting 100% But my mechanic said short drives only until the issue is fixed, Open to reasonable offers