Could be 4,700?

Published: Wednesday, 11 August 2021

PERHAPS there are 4,700 miles of navigable waterways as Mike Todd suggests:

The quote you cite makes no suggestion that all of the 4700 miles are in realms of CaRT. There are plenty others—we have just been on the Wey and Basingstoke, neither CaRT.

Since the article was about boat hire, presumably all of the Broads and similar can be included.