Method
1. Preheat the oven to 230C/210 Fan/Gas Mark 8. Line a large baking tray with baking parchment. Mix the flour, baking powder, bicarbonate of soda, salt and sugar into a medium mixing bowl until combined. Add the butter. Using your fingertips rub the butter into the flour mixture until it resembles breadcrumbs.
2. Stir in the blue cheese and spring onions. Combine the milk and egg in a jug and add to the bowl. Mix together until just combined.
3. Drop heaped spoonfuls of the mixture onto the prepared tray (around 2 heaped tbsp, piled on top of each other as they spread when cooking) and bake in the oven for 10-15 minutes until golden and risen. Leave to cool.
4. Meanwhile, bring water to a boil in a medium saucepan. Add the eggs and boil for 10 minutes. Drain under cold water to cool, then place into a bowl with the mayonnaise. Mash together using a fork, then stir through the herbs and season to taste.
5. To serve, slice the scones in half with a serrated knife and pile the egg mayo on the bottom half before topping with the lid.
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