There is graffitti on the canal wall behind the westbound bus stop at Lebreton Station. Someone took the trouble to climb a fence, go down into the canal and paint the words "hue suck" in metre high white letters with black outlining.
I suppose it is possible that the artist is making a statement against colours. They used white paint. Still it seems almost certain that it is intended to be a punnish insult to everyone who reads it.
If I ever get the energy and nerve to go somewhere I'm not allowed to go, wade around in possibly polluted water, and paint seven very large letters, I hope that I will come up with something better to write.