Ive got a set of 071c's now, i'll give them a go and try a 0.7mm gap (thanks to stu @ msd)
I've always stuck with NGKs and never really ventured away, but i'll give these a go and report my findings lol!
Cosmeister, not recently on the a11/47... But i may have been on there at some point! The old girl hasn't ventured far outside of essex recently!