It was great coming across this thread. For some reason, I have never forgotten a newsfeature on the Dudley tunnel which was shown some time in the '60s on Midlands Today on the Beeb (or was it the other lot). It showed a barge going through the Dudley tunnel, feet pushing and all while the song was played. Being brought up in Smethwick/Birmingham (Holly Lodge Grammar School (for Boys) too answer another thread) we often went to Dudley (Castle+Zoo). but I never actually saw the tunnel.
Anyway cheers for the words.