A schoolboy in Britain is facing life sentence for murdering his former girlfriend -- after a friend promised him free breakfast if he did away with her.

Joshua Davies, 16, and Rebecca Aylward, 15, split up but she still visited him, hoping they would reconcile.

The boy, however, plotted to give her deadly foxgloves (flowers), drown her in a river or throw her off a cliff.

Rebecca bought new clothes for a 'date', unaware that Davies was telling his friends how easy it would be to kill her, the Daily Mail reported.

One of his friends promised to buy him breakfast if he murdered Rebecca.

Two days before the murder, Davies messaged the friend: "Don't say anything but you may just owe me a breakfast."

Davies lured a cheerful and fun-loving Rebecca into woods where he battered her to death with a rock, the court heard.