Police describe the suspect they're looking for as:
- White, aged between 22-26 years
- Approximately 5ft 11ins
- Slim build and with short dark hair and a brown moustache
- Wearing grey tracksuit trousers and tracksuit top with a white motif on the front of the top
- Riding a purple mountain bike with black handle bars
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Transport for London has made the badges and accompanying cards permanently available after a successful trial in autumn last year.