Thanks, that gives me a few things to try. No smell of diesel. Engine replaced about 40k miles ago, so injectors probably ok (but one for the check list).
Thinking I will check wiring first, had dash console out a couple of months ago to change instrument light bulbs over to LEDs (was fed up with no being able to see the instruments in the dark!!). Maybe I dislodged something when I put it all back together.