The main oven thermostat is connected directly to the rear of the control knob (and is entirely different).
The most likely situation is that the oven was fitted with one of two different parts to control the cooling fan.
All the sites I've looked at show two different parts, one marked with a red spot, one with a blue.
As Z says, you're going to have to slip the oven out and check the part (which, afaik, is fitted to the outside rear of the structure).
Given the way it looks like it mounts, the colour of the spot should be easy to see without any further dismantling (as long as it hasn't rubbed/burnt off). Then it is a matter of ordering the matching part.
shop.ukwhitegoods.co.uk/catalogsearch/result/index/?p=2&q=ZOB343X
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