Rang magnicor UK
They will do me one lead and have said if I send them my old one and it’s a componant failure they will reimburse me the new lead price 
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Check your injectors run some cleaner through the tank redex worked a treat after spending £180 on some Twatt to diagnose, car is completely different will be getting injectors off and cleaned soon 
How did you get on did you sort the missfire mate ?
Yeah my number 6 magnacor lead had internal breakdown on rubber sleeve which surrounds porcelain causing a short on and off.
Got in touch with magnacorrect UK and they sent me new lead.
Apparently they have ten year warranty against failures.
All good now
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