Spotted this, and bought, tonight in Asda. £10
Gross weight is 2.3 kilos (it says on the box), product feels like 1.5 kilos but I have no scales at home.
Closed dimensions are, in millimetres, (L)310 x (W)310 x (H)76
In old money that's 12 x 12 x 3 inches.
Cooking area is 28 x 28cm...