Checked out the ecu, no signs of corrosion or any water/moisture getting into it

Found a bad earth that goes from the battery to the ecu, sorted that out and took it for a drive

Driving great ... for about two miles, then it cut out on me, this time when I tried restarting it, totally dead electrically, not a single light coming on when when turning the ignition

It was as if there was no battery in the car and I'd fully charged it a few days previous, battery is fine

A mate came out with jump leads, fired up straight away no problem, drove it back and it was driving fine again

Must be electrical, bad connection or something somewhere, I'm off to lanzarote for a fortnight tomorrow so I'm just gonna leave it with the local garage and have them go over all the connections they can find, clean them up etc

With luck they'll have sorted it by the time I get back