does british waterways own a banksy by the canal bank?

I am not any kind of art expert but this (above, click to enlarge) looks very much like an original Banksy under a canal bridge. If this is a Banksy it could mean British Waterways owns a fairly valuable piece of artwork, although it is by no means the finest example. Of course there could be legal arguments as the bridge may not belong to British Waterways. However it does look like it is built on British Waterways land, so BW could own the freehold to this Banksy by the canal bank.

• Floating in the City will always support an all out war, using what ever means necessary, including Apache helicopter gunships, against the ego driven 'tagging' graffiti nobodies who insist on spreading their marks like dogs where ever they go. However there are usually exceptions to any rules and Banksy is obviously one. Hopefully the excellent graffiti clean up squads who have been cleaning up the towpaths will not go the way of Westminster Council who insisted on destroying a popular Banksy artwork in the center of London despite local opposition.