(03 Jan 2019, 8:59 pm)Jamie M wrote I think thats more advice than protocol, but I may be wrong.
Yes I would take that view too. In the actual regulations (page 34 under 'Best Practice') it says:
"A good destination and route number display will be clearly legible by day and night and commercial advertising should not detract from them."
This isn't me defending them, I still don't like the display, but they technically aren't in breach of the regulations.