Further to last Thursday's post. This mysteriously appeared yesterday on the plasterboard where the bathroom mirror's supposed to go.
When queried the Rocket Scientist involved informed me that he may have overpromised our soon-to-be-arriving house guests about the completed state of their bathroom - who would have thought!! The above also appeared a little later on the same piece of plasterboard. I was informed that this was the formula he will use to complete the bathroom.