Ok, I have replaced the plugs again with NGK Platinum plugs, I have cleaned both AFM's with contact cleaner, I have inspected the coil packs and found them to be in good condition/working order, I have cleaned the air filter elements. Fuel filter will be done this evening.
After doing this I've taken it for a drive and found it to be running very smooth, however anything over 0.9 bar of boost results in missing?