So this is the 3rd year I've done my own service and the past 2 years have gone perfect.

Today I replaced oil filter, fuel filter, air filter, cabine filter, ACE filter, oil, coolant.

However, the car started then quickly stalled after maybe 5 seconds of running and hasn't started since. My first thought is fuel starvation and after doing a live scan with my iCarsoft I can see the fuel rail pressure is 1.14 MPa (desired says 30MPa).

I bled the system and there fuel flowing out of the Schrader (sp?) valve.

Anyone have any ideas what caused this? Could it be a dodgy fuel filter?

No so familiar with your model but you say you've bled the fuel through and it started then died,,,, I would be looking at your fuel pump. Your live values indicate low pressure but not sure if this with ignition on or when trying to start etc. 2010 RRS, TDV8
bali Blue / colour coded
side steps / flappy paddles
black perforated leather
22" overfinch
heated everything, TV,fridge ...... now with gold calipers and mud flaps !( black mud flaps that is) !!
Many years ago,,,,, 1955 series 1 landie , sometimes wish I had kept it

So this morning I cracked the high pressure pipes to the injectors and had zero fuel coming through on crank.

Fitted the old fuel filter and all is well again.

Faulty fuel filter from factory... FML

Good result👍🏼