RE: FAI fuel
Morgan doesn't have a clue what real FAI fuel is but that goes for most American fuel manufacturers where it's just become a generic term for any fuel with zero nitro. There's a reason why FAI fuel is 80/20 methanol/castor. To keep a level playing field in events where power is an absolute requirement (CL speed, RC Pylon. FF power) the only fuel allowed is methanol, no spiking with nitro or any other additive that can burn and possibly add to the power output. Castor was chosen as the oil because it doesn't burn and is well known for its lubricating ability under extreme conditions. Also it's cheap and readily available.
Engines available in the UK are exactly the same as similar engines available in the USA (OS, Enya, ST, you name it) and they'll all run perfectly well with zero nitro. As a for instance, my old (second hand) ST GS45 ABC with its low compression of 8.5:1 turns an APC 10x6 at 14,600 on 75/25 castor so it's no slouch and tuning is dead easy.