* Fiona S is the tall fit one who works out regularly on her Nordic tracker. Fiona B is shorter, blonder and, er, plumper. She talks the talk about exercising but rarely gets round to it
* Fiona S takes taxis. Fiona B takes the bus
* Fiona B has 4 grown-up children and step-children. (Well grown-up in theory, anyway) Fiona S sensibly doesn’t
* Fiona S is a party girl who hangs out with chefs. Fiona B hangs out on Twitter
* Fiona B is more tech savvy. She has two websites and a blog The Frugal Cook, Fiona S is not frugal. You should see her wardrobe.
* Fiona S has a PC. Fiona B has a Mac (and a shiny new iphone)
* Fiona B lives in Bristol and has a house in the Languedoc in the south of France. Fiona S lives in London and a house in the Isle of Wight where she attends the annual rock festival
* Fiona B has an AGA. Fiona S has a Britannia
* Fiona B has a weakness for chick flicks - and French nouvelle vague. Fiona S loves anything by author William Boyd and likes a dance