A 16-year-old girl has pleaded guilty on two terrorism charges in Britain, including possession of a bomb recipe.

The girl, who cannot be named for legal reasons, pleaded guilty at the Manchester Magistrates Court on two charges, after being arrested by anti-terrorism police this April.

The formal charges are related to possessing a document containing information to be of use to a person preparing or committing an act of terrorism — namely a recipe for explosives.

The same charge is related to a second document.

She was apprehended at the same time as a 14-year-old boy from Blackburn in north-west England, who has been convicted over an alleged terrorism plot in Melbourne on Anzac Day this year.

Both will be sentenced at a later date.