There was a thread on this a while ago, saw this FoI (not my doing!) and they say the smell is caused by a pump issue. So there is definitely a smell (which was the cause of some debate!) - I can definitely smell it.
Any idea what the pump issue could be? https://tfl.gov.uk/corporate/transp.../foi-request-detail?referenceId=FOI-0309-2425
Any idea what the pump issue could be? https://tfl.gov.uk/corporate/transp.../foi-request-detail?referenceId=FOI-0309-2425