Alexandra Zurawaska, 16, has not been seen since at about 7pm on Monday 25 December when she left her home South Yorkshire. 

And Scotland Yard how now launched an appeal for information in a bid to trace her.

Officers believe she may have travelled to Sutton in south London since she disappeared.

She is also understood to have links to the Hounslow, Richmond, Brent and Enfield areas of  the capital.

Police described the teenager as a white female, around 5ft tall and of medium build, with brown hair.

When last seen, Alexandra was wearing a khaki knee-length coat with a fur-lined hood, khaki tracksuit trousers and Timberland-style boots.

She was also in possession of a Land Rover bicycle and may be in the company of an older man.

A Scotland Yard spokesman said: “Officers are growing concerned for her welfare. 

“Anyone who has seen Alexandra is asked to call police 101 or tweet @MetCC.”