Darryl,
What can I say - thank you so much for all your trouble and time. Absolutely clear now that my machine was set up incorrectly. I have swapped over the two offending tubes to match yours and Tilta fired first pull.
I was a bit surprised to find that the connection of the HT lead to the sparkplug is a slotted screw, partly screwed into the lead and then covered by the rubber shroud. However that it what it looks like in the parts manual. If that is wrong, when you have a moment perhaps you could let me know - but its not critical.
I am looking forward to trying the Tilta on my grass verge but I think its going to take about a week to dry out!
Thanks again,
regards
