Il check those tomorrow Dan, I haven't got the LED connected, there's not a great deal of cable length to play with so it was one of those jobs that I never got round to, the Carb is pulling fuel through (this was an original problem but it is now sorted by stripping and soaking the Carb). I'm convinced that the Ignition is the problem, I tried rotating the prop just past the top dead centre position and it had sparked everytime at the weekend, however now all I'm getting is a spark when the unit is either disconnected from an battery or when I turn the Ignition Switch off and no spark when the prop rotates past the TDC.