Cut in the remaining butter to make a crumbly mixture.

Using a knife or pastry blender, cut in the butter to form a crumbly mixture.

Put half of the crumbly mixture into the loaf tin and press it down firmly with your hand.

Pour the remaining crumbly mixture on top to hide the blueberries and pat it down all over, nice and hard.

Add the butter and pulse until you have a uniformly crumbly mixture.

Gently mix the blackberries into the crumbly mixture with the fork.

Combine dry ingredients and cut in butter to make crumbly mixture.

Blend to combine ingredients into a crumbly mixture.

By hand, cut in the butter with a pastry blender or two knives to make a crumbly mixture.

Rub the pieces of butter in with your fingertips to make a crumbly mixture.