The NGK'S have arrived

NGK plugs fitted. Misfire gone during sai running

But

All threw the rev range ive had minor flat spots where for a brief second the engine holds back, felt like the boost cut off these happened every 1000rpm after about 3500rpm but now this seems to have stopped completely :/ infact at 3500rpm the car suddenly picks up more speed as opposed to holding back. Before the NGK'S were bosch supers and before those were denso plugs.

Strange

Check your vacuum lines by the N75 and your breather pipes - sounds like you are picking up unmetered air somewhere.

All those have been checked and forked ones replaced. No air leaks. It seems a common issue

What gap'age? If any.

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0.7

Do you have access to VCDS to do a measuring block check on the engine to see what is happening at all?.