C&RT has several KPIs to achieve each year to retain the grant, one of these being DEFRA wish to see an ever growing number of 'visits' to the Canals, The original figure given in 2012 was grossly overstated so as to 'look good', but, that meant that in order to achieve the KPI each year the figure became more and more ridiculous - I seem to remember that the last figure quoted by C&RT was in excess of 800,000,000 (800 million) per annum.
I expect that is higher than the HS2 will achieve in many, many years.