Thanks for the input guys, no sign of external intervention, had all the pipework apart so no probs there, the diesel is no more than 6 months old as I replaced the in tank pump September last year, I have just purchased a Nanocom on fleebay, I am away from the 21st till the end of the month so when I get back I will hook up and hopefully get more info.

Probably safer than a journey into Rotherham.
 

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