The blue paint in Monkey's room turned out to be a different problem. In removing a block of wood and some greasy marks we found the paint beginning to peel off. We decided to go with it ... a decision we came to regret:
More than a week later:
We made a return trip to B&Q. Much debate ensued, but we came home with Patrician's Purple, Purple Storm and Magical Poetry, which you can't see very well in the photo. Add fairy lights to the bookcase, and maps and animé posters to the walls. Still waiting for the curtains to come back in stock.
Better view of the colours this way: