Coil location
 

Try the front L/h side of engine on coil bracket, mounted off head studs.
The present position of yours looks farily close to the water pipe, is
this transfering heat to the coil??

Hello Andrew, I wondered when you might make the jump from lurker. Good to see you posting.

Cheers
 

Thanks for the heads up Andrew, hadnt thought of it picking up latent heat off the radiator pipe, will re mount and give it another crack.