This is a modern Wedgwood product in their 'Oven to Table' range, so is both dishwasher and oven proof, see back-stamp photo.
This particular teapot is in 'as new' condition, with no marks or chips or crazing of any kind as is shown in the photos. Even the oh so vulnerable spout and lid are completely intact, so it has probably had very little use.
The capacity is two pints, or six cups, dimensions are 5 1/2" diameter, 4 1/4" high.
Neither Chinasearch uk nor ebay have one of these at present, so I am asking £22 ovno inclusive of double-box packing and postage.