The guy in Burtons is talking bollocks. Buy a genuine Ford headgasket and headbolts. I have used both and the Ford is by far the better gasket. Had 2 Felpro gaskets fail and no failures at all with the Ford. The Ford one is also about £30 so a fair wedge cheaper than the Felpro item.
My Felpro let me down whilst I was flat out tussling with a Porsche Carrera 4 on a local dual carriageway.

Was all over the guy as well until it popped between cylinders 3 & 4