The smallest ever freehold - and one of the cheapest - to come on the market with the up-market estate agents Savills is for sale at pounds 20,000, including all the contents.

But you would have to shrink more than the kids to fit into it. Seventy- one inches wide, by 74 inches high, it is an exact replica of part of Island Hall, Godmanchester, in Cambridgeshire.

No detail has been ignored; the minute inkwells and candelabras are silver, the saucepan is copper and the kitchen table drawers contain cutlery. A four-poster bed is covered with 18th century silk and beside nanny's bed is a glass of water with false teeth in it. The mahogany desk, with cross bands and inlay, brass castors and dovetail joints, cost pounds 800. Cheval glass, wardrobe and tiny coat hangers complete the bedrooms.

"Like any property, we've worked out the pounds per square foot," says Clare Berry of Savills, "or in this case, per square inch. It's roughly pounds 598 per sq ft, directly comparable to prices in Belgravia or Knightsbridge."