Yesterday (6 September), starting my day in Portsmouth and finishing in Newcastle I can across 3 Thorns:
A black Raven in Portsmouth near the Naval Base at around 0700.
A black Sherpa in London crossing Waterloo Bridge at around 1300.
Another black Sherpa in Newcastle at Fawdon Metro station at around 1730.
The most that I've seen in one day, if discounting tandem club events.
