RE: MDS 48 PRO
Jez,
Nige is in the UK, so he must have the Euro version...
I believe no nitro is what the doctor ordered.
As to Enya plugs, their #3 is the hottest, like OS' A3.
It is also what they recommend for four-stroke engines, despite not having a 'shrouded' end.
Their #4 is like the OS #8...
Their #5 is like the OS A5.
But...
Enya plugs are real long-reach; not mid-reach like OS plugs.