Cheers for that lads. Well took the car for a bit of a spirited drive. It's hard when you live near the city to find anywhere to open her up without doing anything silly.
Anyways I think it is definitely pinging. Noticed the noise was louder under load booting it up a hill. Could be be carbon build up from lack of long drives etc? I'm nearly finished this tank of fuel so maybe could I add an injector cleaner mix into the next tank? Might try Caltex 98 instead of the bp and see if it makes any difference.
Noise is definitely only under load and not when free revving. Hmmm.
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