Canals and tow paths are indeed usually "legally" opened and closed by Acts of Parliament. In the case of the K&A we are discussing here, that was specifically the Kennet and Avon Canal Act, passed in 1794. Whilst its closure was discussed in parliament, it was rejected although the nearby Wilts & Berks Canal was, I believe, closed by an Act of Parliament just before the Great War.How can anybody "legally close" any route? I've often wondered when I've seen (and ignored) "road closed" signs. Surely you would need to get some kind of statutory order like the highways authorities do sometimes but how would they actually enforce the closure? Could you be prosecuted for using the road?
OK but does closing a route or road mean there's a statutory prohibition on its use or does it mean you simply no longer have the right to use it? Could you be prosecuted for nipping down a closed road or a footpath?