Bicycle Tag of bike

All I can see is:

It also has links with the children's author E Nesbit, who lived here as a child.

https://www.royalgreenwich.gov.uk/directory_record/3797/well_hall_pleasaunce

E Nesbit isn't Rab C Nesbitt, of course, but cryptic clues probably do that sort of thing. Not that I would know, as I avoid cryptic clues.