Patrick Warren and David Spencer

They were the first missing children to appear on milk cartons in the 90s and were known as the milk-carton kids.

But Patrick Warren, 11, and David Spencer, 13, have never been found.

They were last seen on Boxing Day 1996 when the friends told their parents they were going to visit one of Patrick’s brothers.

But the boys never arrived there.

The last known sighting of them was at a petrol station near their home in Solihull, Birmingham.

An attendant gave them a packet of biscuits, and saw them walking towards a shopping centre at midnight.

Patrick’s new red bike was later found abandoned behind the petrol station.

Their disappearance is still a mystery to this day.