George. You could place an old Rovers biscuit tin on top and then have a double oven. Or puncture some holes in the tin, put in some hickory wood chippings, utilise the grill rack from the lower oven and then you could slowly smoke slices of beef whilst your Yorkshire pudding cooks beneath. Or buy a Nipoori oven, discard the bottom halve, locate the top cone on to your unit and then you would have an electric tandoor to tikka your chicken whilst cooking naan breads in the lower oven at the same time - I can just see the patent office rubbing their hands already.
Bon idea.