Re: Hotpoint double oven
Several models end in 53X, with two very different types of fan motor. Looking at the door handles as well then I would guess it is the most common type of motor fitted to Hotpoint cookers, C00230134. That one is over £55 but the Alternative is every bit as reliable in my experience.
Of course you could drag it out to take a look, the other type of fan motor does not have the large round mounting plate like that one does.
Jim.