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[Kevin Wood]

When the error codes come up, there is no throttle control at all. The engine just and I mean only just ticks over and  sounds like a wet fart on loudspeaker. You can press the throttle all you like and get absolutely no response... When you clear the error codes, the engine runs sweetly and the throttle is absolutely fine. The only obersvation I've notices is that once the car starts hunting for gears, within the next few times I start the car I can almost always guarantee the same error codes will come up and the symptoms described will reappear.

That sounds like the throttle control going into limp-home to me, so it's either the throttle body servo or pedal position sensor, IMHO.

As TheBoy said, get some live data, and see what happens to reported pedal and throttle positions as you move the pedal / throttle. The sensors are dual redundant so you will see 2 voltages plus a percentage for each.

Also worth taking the throttle body off and giving it a clean, making sure it can be opened smoothly and is springing back closed.

Kevin