Prior to their arrival there had been a slight misunderstanding. The film company asked if they could use the library's toilets. There was a bit of consternation until it was made clear that the toilets would be for location staff use, not as a film location.
We take the opportunity to tease Beryl:
"No knocking on the door asking: 'do you need any help in there?'"
"'Do you need that shaking so you don't spoil your costume?'"