Besides... did BS546 plugs ever have sheathed pins?
Not originally, but they've been available for the last few years. The commonly used (in the theatre) Duraplug (MK) doesn't have sheathed pins though.
To be honest, I think this sleeved-pin issue is something else which is being blown out of proportion as well, especially when one considers the possibility of much easier contact on something like a lampholder. You have an opening almost an inch wide with live pins easily accessible to even large fingers.
