[ben]

All my series 15 units came with 3-core leads. I have a series 12, of roughly similar vintage, bought in Europe which has a 2-core mains lead and moulded plug. So it clearly depends on country of origin.

In Europe you can still find unearthed schuko-style mains sockets in vast numbers of properties. In our place the schukos are unearthed apart from in the kitchen.