sorry for the late response
timing was checked and was fine & car wasnt losing any power, mechanic couldnt find the issue but when he unplugged the solenoid, the noise stopped & returned when plugging back in
after a few more weeks driving i got epc light the eml light
fault codes were P0011 & P0341
car would go into limp more after 4k revs,
after doing some digging online with these fault codes & the similar noise on the gold GTis
i narrowed it down to the camshaft adjustment valve which cost me £55 shipped from germany which took 5-7days ( seat dealer ship charging £153 with a 2-4 week wait )
Part number - V10-4472
manufacturer - VAICO
6L109257F
by no means a mechanic & i barely know how the engine works by from my understanding
theres two solenoids/magnets/camshaft valves, one for the exhaust & one for the intake
the Magnet pushes against the valve and the valve controls the camshaft timing
mechanic took out the valve ( exhaust )and it was all busted up, after replacing the the noise has gone, no eml or epc lights
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