Do you think that perhaps CaRT is calculating those hundreds of millions of visitors by multiplying the number at boat shows?
There must have been 10,000 or so at the one at Crick that CaRT is involved with, and I expect it could count them all as visitors, and there are quite a few though I guess of lesser number at other shows, and we are all aware of its trend to exaggerate.
Mind you, I have to admit I'm not sure how it calculates so many in winter, as I understand the towpaths are deserted.
Edwin Deacon