Following on from the spark plug issue:

Debris seems to have made its' way out, as a lot quieter.

Engine runs ok, if a bit throaty, and revs freely,and pulls like a train, but still hunting at idle, (450-600) rpm. 

I've replaced both coil packs, all 6 plugs and all three layers of gaskets/seals on the inlet side.

Engine idles better with the MAF sensor plugged in, although starts to hunt more and misfire slightly if left to idle for long periods, ie over 10 mins. Temp still fine, oil and coolant not used a drop of either.

Emissions light has finally gone out, though I should probably put the bulb back in... 

Seriously though, not sure what else can be done without some in depth dismantling.

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done.

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no, yes.

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No, small pipe from non return valve on brake servo vac pipe disconnected as connector busted, (on order from vx).

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Seems to get worse as it warms up.

Had a run into London last night, Gatwick to Balham, back to Coulsdon: no probs. But started to run more and more roughly as I got on to the M23.
Can only describe it as like trying to drive a laden 7.5t lorry up hill with the exhaust brake on. Basically no power, wouldn't rev/ pull uphill, although level road/ downhill not to bad,almost as though there was no torque.

The engine eventually cut out on a roundabout. restarted at the first turn of the key, and was running as if nothing had happened. 

Starts to run rough if stationary for long, but switching of and on again seems to cure it, which makes me think electrical.

No new fault codes though