A man has been robbed at knife point after giving another a man a cigarette.

British Transport Police are hunting a knife man after the robbery.

The victim, a 21-year-old man, was threatened with a knife by another man after giving him a cigarette at about 4.50am on August 25.

The suspect was pushing a silver bicycle and approached the victim and asked him for a cigarette.

The victim had £30 cash in the wrapper of the cigarette box which the offender saw.

After being given a cigarette and smoking it, the offender followed the victim up the station ramp towards a nearby shop.

He then produced a knife and threatened the victim with it.

He stole £30 and a lighter from the victim and left the scene on the bicycle.

Officers would like to speak to the man shown in the CCTV images as he may have information which could help the investigation.

If you know who he is, if you witnessed the incident, or if you have any other information which could help the investigation, please contact BTP by calling 0800 40 50 40 or text 61016, quoting reference number 59 of 25/8/17.