Ah the place is Palace motors on Park Road crouch end. The have some interesting cars parked up outside, the corsair, there is a nice older saab and jaguar xj growing moss. The car sales has some interesting bits the mercs and the mustang at the moment. They were selling a mint low mileage mk2 golf gti.
Think the owners/workers run a 60s morgan, BMW 8 series coupe and other interesting older cars.