@Cobber The newest part (prior to the fault) was the fuel pump but it was repaired around 2 years ago. Since then i've done two one hour journeys and all other journeys shorter than 20 minutes. The issue only reared its head after I took her out for a long journey; 2 hours of solid motorway driving (at the speed limit) and then hitting slow traffic where she died when i accelerated up hill. At the time I thought it must be an overheat issue but the temp guages hadn't moved for the duration of the trip (I did have the heater matrix on full whack - the tried and tested way to prevent MGFs from overheating).
I'm guessing to test the fuel pump I test the pressure whilst key's in the ignition position? Is there a pressure test valve on the fuel rail I can press with a screwdriver (obviously i'll clean up the fuel once i've tested)?
Edit: I should add that I can hear the pump doing its usual priming whir when turning the key to ON (Position 2)
@Steve I've not had any sudden braking or run the tank anywhere close to zero so i dont think fuel cut off switch will have popped but i'll check and see.
@Airportable are you adding credence to steve's suggestion or is this a different "cut out" component I need to look for?
Sorry if any of these questions are blockheaded