The only clue to the identity of a dead young man whose corpse was discovered on a bus from Queen's Park by a fellow passenger is this grainy gym card picture.
The man, who is believed a Polish and aged between 20 and 30, was found on the top deck of a bus by a commuter last Monday at around 7am. CCTV footage shows him boarding by Queen's Park station at around 12.30am, when the bus was in service on route 36.
By the time his body was discovered, the bus had started on a different route as a number 171 in south London.
The only clue to his identity was a gym card he was carrying, with the name Pawet Modzelewski, for a Fitness First gym in Acton.
PC Chris Brown, of the Missing Persons Unit, said: "We have followed several lines of enquiry to formally identify this man, but have so far had no luck.
"We're anxious to trace anyone who may have known him and would appeal particularly to members of the Polish community."
It is thought he may have been a tradesman.
"Friends may be starting to wonder why they haven't heard from him and his employers may also wonder why he hasn't turned up for work. It appears he might have worked in some trade - his clothes had paint marks and his hands indicated he probably worked in a manual job.
"We believe he probably lived in north west London," added PC Brown.
The dead man was at least 5ft 10ins tall and of a muscular build. He was wearing a grey zip-up anorak, a blue tracksuit with a stripe down the side, a t-shirt and white trainers, and was carrying a bag. A post mortem examination has been carried out which was inconclusive, but police do not believe the death is suspicious.
Anyone who recognises the photograph or who may know the man should call the Missing Persons Unit on 020 8284 8450 or Crimestoppers anonymously on 0800 555 111.