Earthed (Grounded) Stubby Plug for MacBook AC Adapter
I have only just discovered this problem with a 2017 MacBook Pro. I get a tingling feeling from the MacBook and realised that the earth part of the apple UK 13 amp plug is a dummy (not connected with the circular locking spur on the charger unit) but I noticed on my early MacBook Air that there was an earth connector on the apple plug and so I swapped it and now I do not have the tingling problem. I do have it on the Air with the new "improved" apple plug.