My Britannia Range Cooker starts to fire the gas ring igniters as the small oven (on the right) heats up. Very slowly at first, but with increasing frequency as the over comes up to temperature. Reverse occurs when the oven cools down.
All igniters are clean and work perfectly normally when the oven is off.
I’m assuming it’s the 6 Way Cooker Ignition Block or the microswitch(s) at fault.