Engine behaving weird upon ignition

Hi all

I'm looking for a little advice if anyone out there has any idea what could be going on. I've been to my local diesel garage and they couldn't work it out.

For the last few months my car occasionally fails to start when I turn the key. This is usually resolved by trying again and the second or third attempt usually gets me going. Sometimes the first (see below)

If the engine starts after my first attempt, I pull off but the engine cuts out quickly and needs a full restart again before normal service is resumed.

The engine management light goes on and off, some days it is on and some days it's off.

I'm at a bit of a loss tbh. I've serviced the car since new and looked after it. Mileage is 85k and it's going in for a new clutch next week. 2008 match TDi.

Thanks in advance