Preheat oven to 400 F.
Combine flour, sugar, baking powder, and salt in a bowl.
Cut in cold butter until mixture resembles coarse crumbs.
Stir in heavy cream, egg, lemon zest, and blueberries until just combined.
Turn dough onto a lightly floured surface, pat into a 1-inch circle, and cut into 8 wedges.
Place wedges on a baking sheet and brush tops with milk.
Bake for 15 minutes until golden brown.
Meanwhile, whisk softened butter and honey until smooth.
Serve warm scones with honey butter.