Police investigating an alleged indecent exposure on a tube train have released a picture of a man they want to speak to.

Two women, aged 21 and 27, saw a man allegedly expose himself and perform an indecent act on a Metropolitan line train between Finchley Road and Ickenham, on November 25.

The first incident happened at around 2.45pm, and the second half an hour later. The suspect got off the train at Ickenham station.

PC Paul Franklin, the British Transport Police (BTP) officer investigating the incidents, said: "Officers are carrying out several lines of enquiry, including viewing CCTV footage.

"Unwanted sexual behaviour of any kind is not tolerated anywhere on the rail network and we take all reports seriously.

"If you recognise the man pictured, I’d urge you to come forward and speak to officers."

Anyone with information is asked to contact the BTP on 0800 40 50 40, or text 61016, quoting background LUA/B2 of 10/12/13. Alternatively, call Crimestoppers anonymously on 0800 555 111.