Good afternoon

This is my 1st post and I am asking this question on behalf of my sister, so I am sorry if the details are a little sketchy.

I have performed a search and found many threads regarding diesels stopping and associated poor starting etc but not this problem. Your help is very much appreciated.

She was driving in the rain - it has been raining on and off all day today - on a dual carriageway doing approx 50-60 MPH. She pulled out to overtake a van and the car lost power - may have stopped running - she's not sure - but she had her foot planted and it wasn't accelerating. She says it felt like when you just get to the front of a lorry you are overtaking on the motorway, how it sort of pushes you back. The Glow Plug light came on whilst this was happening.

She managed to get the car over to the hard shoulder and she turned it off. After a minute or so to gather herself back together she turned the ignition back on, waited for the glow plug light to go out and it started straight away and there were no further problems for the remaining 1 miles home.

She's not sure if it produced any smoke at the same time as it lost power/cut out.

It has recently had a service and a new intercooler and associated seals.

It starts first time every time, so I don't think it is the camshaft or crank sensors.

My thoughts are something to do with water in the electrics? However it has been fine in the wet before.

I don't have any experience of Ford Diesels, but have plenty with Vauxhall and Rover/BMW.

Does anyone have any ideas? Any pointers for where I should start my investigations?

Thanks in advance

Chris