Thanks very much for your reply. Before you bother with me any more, could you please make sure that my deposit has been re-instated. I didn't think that anyone had looked at my question at all and a week later revoked my deposit - I hadn't seen your email. I have emailed the team asking for it to be re-instated. Apologies.
The gas hob is also made by Whirlpool, and would have been installed in 1996 - 4 gas rings with the controls to the right-hand side, all in a straight line. The hob has been fitted into the work surface and there is a gap of about1cm between the top of the oven beneath and the underside of the work surface housing the hob, but I can't see any kind of model number on the hob. The hob itself has no drawer beneath it. To be honest, I don't know how I could get to the underside of the hob without taking out the entire oven ( and the plinths etc in front of it ) to replace the ignition, as I can't see how I could lift the hob off.
On the right-hand side of the oven door-frame is the model numberAKP 511/AV , but I suspect this pertains to the oven only, and not the hob above it.
Sorry I can't elaborate much more.
With thanks and best wishes,