Hilary's 'Icing the Cake' initiative is spreading... but not always successfully. Best behaviour has a habit of bringing out the worst. Pippa has a lunch appointment with Peter, while Den and Hilary have a difficult matter to deal with. Kim embarks on a vendetta of a different kind. Will they ice each other's cakes?

• Joanna Scanlan
• Vicki Pepperdine

• Joanna Scanlan
• Tobias Menzies
• Peter Capaldi