As far as I'm aware the landowner would own the mooring rights to that side of the canal.
There are no riparian mooring rights alongside the canal. The owner would have to apply to the Canal and River Trust for what is commonly known as an 'End of Garden' Mooring with an annual rent (around £500 to £700 pa) being paid to C&RT which would be non transferable on sale of the land. Many a person has come unstuck by speculating on mooring rights hence the fact that it went for such a low price.
Knowing the weakness of this side of the canal it is highly likely that C&RT would refuse such a permit along with the fact that official C&RT 48 hour moorings are directly opposite.
To be honest if there was a chance of mooring rights being granted I would have had a little bit of a punt on this and of course would have expected the price to be a lot higher.