It's A Bad, Bad, Bad, Bad World (1) - S6-E22
Corrected entry: When Sheila arrives at the manor she says something along the lines of, "It's becoming a habit isn't it? Me turning up a wreck," but the last time she went to the manor a 'wreck' was because Darryl was in trouble and the cleaners erased her memory, so she wouldn't remember turning up all upset.
Correction: Actually she says, "It can't be happening, I am usually NOT a wreck."
Stephen Edmonds 1