Scotland Yard's Marine Policing Unit has been reporting that a pod of dolphins has found its way up the Thames:
Marine 2 have been alerted to a sighting of a dolphin near Tower Bridge.
No further sightings of the #dolphin to report of. We're not sure if its here by accident or whether it swam here on porpoise......
Breaking #dolphin news.. Marine 2 are following a pod of about 5 harbour porpoises in the Lambeth area of the river.