Preheat the oven to 400 degrees.
In the bowl of an electric mixer fitted with a paddle attachment, combine 4 cups of flour, 2 tablespoons sugar, the baking powder, and salt. Add the butter and mix on the lowest speed until the butter is the size of peas. Beat together the eggs and heavy cream and, with the mixer on low, quickly add them to the flour-and-butter mixture, combining just until blended. Toss the currants with 1 tablespoon flour, add them to the dough, and mix quickly to distribute the currants through the dough. The dough may be a quite sticky.
Dump the dough out onto a well-floured surface and knead quickly to be sure it is well combined. Flour your hands and a rolling pin and roll the dough 3/4-inch thick. You should see lumps of butter in the dough. Cut into circles with a 3-inch plain round cutter and place the circles on a sheet pan lined with parchment paper.
Brush the tops of the dough with egg wash. Sprinkle with sugar and bake for 20 to 25 minutes, until the tops are browned and the insides are fully baked. Serve warm with clotted cream and jam.
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