Ive checked the top mount under the ECU, its new still silver but the nut was done up handtight. Ive done it up and its quietened it down a little but its still knocking. Just to add when that mount was taken off, i shook the engine as it was loose and being supported by a trolley jack, and there was no knocking when the engine was being shoved back and forth. Maybe its the lower arms then? Damn thing!