Is there not another question which basically asks if it is a factory fitted system :?:
I have seen the question about Thatcham devices asked on comparator sites but have always been able to move on by ticking a third option as above. :?
If you can't find away round it I would suggest that you try elsewhere; you would have nothing to lose.
Below is a screenshot of the dialogue box on the gocompare.com site and you will see the "Manufacturer Fitted" appears as an option
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