Read label on oven and it says it has a load of 2.9kW and I think the mains is 230V.
From physics I recall that P=IV => I = P/V => I = 2900/230 => I = 12.61A
Would I not get away with a 13A fuse on a plug, which is plugged into the cooker socket, which in turn is on its own circuit connected...