Thanks for the welcome fellas.
Ive had the car serviced by Paul at AP Automotive and hes been brilliant.
It came with early Ktech crackle back tune and a sports exhaust that has complicated the diagnosis process. Its back running on the "stock" Ktech file and the coilpacks have been done. Had it scanned on the clip cleared fault codes and live data logged on RStuner but dosent flag any sensor fails or running problems.
Next step is to try swapping out throttle body and pedal potentiometers. Failing that it looks like an ecu problem.