Preheat the air fryer to 200 degrees C and set for 45 minutes.

Prick the potatoes all over with a fork.

Rub the potato skins liberally with oil and sprinkle on some salt and pepper.

Place in the air fryer on the crisper tray, and air fry for 45 minutes until the potatoes are soft in the middle, returning for up to 15 minutes if necessary.

While the potatoes are cooking mist a non-stick, flameproof pan with cooking spray and warm over medium heat on the hob.

Add the bacon and cook for 5 minutes.

Add the leeks and cook for 10 minutes until they are soft and the bacon is as you like it.

When the potatoes are cooked, cut in half along the longest side.

Scoop out the potato and place it in a large mixing bowl.

Add the butter and mix well.

Tip in the cooked bacon and leeks and stir to mix through.

Return the potato mixes to the skins, distributing evenly between them.

Sprinkle over grated cheese.

Return to the air fryer and air fry at 200 degrees C for 5 minutes.