Hi Hugo,
As you contributed as a Guest I wasn't able to contact you directly. I maintain the Songs of the Inland Waterways web-site which aims to provide a repository for songs about British canals. I have taken the liberty of including your 'Lock-keepers Daughter' song. I hope you don't mind - please let me know if you do and I will remove it. I would be happy to include the other songs you mention if you would be kind enough to provide them. I can be contacted via the web-site.
Cheers,
Ian Bruce