Signs and handles

The Canal & River Trust is the charity which is charged with managing and maintaining the majority of canals in England & Wales. Its idea of doing this seems to comprise erecting a huge number of blue signs and notices across the network. This is the old toll office at Marple which is listed Grade II. The wooden board upon which notices to boatmen were displayed is decaying, with the top to keep the rain off disintegrating. This has not prevented the placing of a hideous sign welcoming people to the Marple Welcome Station, whatever that is. Meanwhile a new notice has appeared on the porch which advises us that this is a Green Heritage Site, whatever that is. To cap it off the accessibility handles at the entrance have been made as bright and hideous as possible. Doesn't any of this require listed building consent?