In Dorset, rain and storms threaten Mapperton House's annual plant fair. In Staffordshire, the Cavenagh-Mainwaring family are dealing with leaks of their own at Whitmore Hall. Nova Guest is thrilled to sign off her summer season by inviting the first visitors in to the newly-restored Gunpowder Plot room at Ashby Manor, and at Chavenage in the Cotswolds, James and Emma are finally ready to open up their vaunted sauna project to guests.