Accompanied by the sound of a chisel on slate :Jerry:, managed to produce the following words of wisdom
I'm not going to name the experts, as it's a Stag engine, but these guys are thorough, meticulous and absolutely professional in everything they do. They repaired the engine free of charge as a goodwill measure even though the failure was *not* caused by their workmanship.
As for the experts detecting the fault, without crack testing the heads you'd not have seen it coming. Who crack tests brand new cylinder heads?
I remember in 1976 most of the cars delivered to my dads garage were done by transporter. I remember vividly two brand new Cortina 2000E "Olympic"s and a Granada 3000 Ghia S (With Aircon!) being delivered ready for the new "R" registration so it wasn't unusual for transporters even then.