I wonder if Buccaneer66 has researched the Leeds & Liverpool Canal, Lancaster Canal South End?
This tunnel business sparked a memory.
I was born in 1947 and brought up in 4 Redvers Road Wood Green, London N22. During the early fifties, the family next door moved, and were replaced by Mr. & Mrs. Murch, with their two sons Paul & Alan. They hailed from Leyland, Lancashire. While the families got on well, they decided to move back to Lanacashire into a 'new build' house in Whittle-le-Woods. Being the very first residents in the new road, they had the opportunity to name the road, and they named it after me - 'Derek' Road.
They invited us up as a family to help 'warm' the house. Derek Road is off Mill Lane, and their back garden was steep, rising up from the back of the house at the top of which was an overgrown path beside a waterway. Paul, Alan and myself ventured along the canal, beneath Moss Bridge as I now know it, but stopped at the Whittle Tunnels. The waterway was still in water but weedy. At the time I never knew about canals, and nothing about that one, except that there was a wider basin just below Moss Bridge.
Using the National Library of Scotland maps, it is possible to see through the overlays where this brach went. From Johnsons Hillock locks to the Walton Summit, where an interchange basin looks to connect with a tramway leading to Preston.
https://maps.nls.uk/geo/explore/#zoom=16.6&lat=53.69322&lon=-2.63601&layers=6&b=1
Derek Road runs through what was Swansey Mill. Mr. & Mrs. Murch lived in No 6 Redvers Rd, Wood Green, and moved into No 6 Derek Road around 1955.
Moss Bridge remains, but not the canal.
https://www.google.co.uk/maps/@53.6920959,-2.6350533,3a,45.5y,70.82h,85.96t/data=!3m6!1e1!3m4!1sQ47YaTPiFL9rjgZ9A7K3Sw!2e0!7i16384!8i8192?hl=en