if by Whitchurch, you mean the one on the A49, then it would have been the llangollen canal – one of the prettiest canals on the network, and passes through some stunning countryside. it also has Telford’s stunning Pontcysyllte Aqueduct along its route – towpath on one side, but a 120ft drop on the other with no barrier to the side of the iron trough your floating in.
Have done a couple of holidays on a narrowboat – both on the Rochdale canal and the Calder and Hebbe canals, starting at Sowerby Bridge. The Rochdale can be hardwork, as it averages 3 locks per mile, and has 91 locks on its journey from Sowerby Bridge to Manchester (used to be 92, but Tuel Lane Lock is a combined lock 3 and 4 as the original locks were built over after the canal closed.) and since it takes about the same length of time to work a boat through a lock as it does to travel a mile. progress can be slow – but your on holiday, working your way from one pub to the next. Or just deciding to moor up on the tow path just cos its a lovely view.
is very relaxing tho – basically going at walking pace the whole time, with a bop bop bop bop soundtrack from the little disel engine