Just taken her for a spin with tunes cracked up. Tried touching the metal before puttin my feet on the ground and didn't get shocked so that's a start. I thought it was unlikely to be the amp but I only notice it when getting out after having the music loud, maybe I just move about more when it is
Got the cloth seats + mats, usually wear jeans + t-shirt + trainers and get shocked whether it's on gravel or tarmac....