Susan is looking forward to the birth of her first grandchild, but not to being a grandmother. Nick wants to move back in. And a new arrival at Ben's surgery has quite an impact.

Susan decides that she and Ben should take dance lessons, but they soon find that it takes more than two to tango.

Normally, nobody in the Harper family would willingly set foot in Nick's flat, but when Susan's mother comes to stay, it suddenly seems more attractive.