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Haha yes, I've had a few people tell me it's far too steep! Main reasons for my choice were logistics (my father lives close by so somewhere to sleep before and after), volume of traffic (it's the quietest road up that ridge that I know of for motor traffic), and descent quality (silky smooth tarmac, well sighted, and wide, so no need to touch the brakes).
Have you everested before, or are you considering one?
Kop Hill near Princes Risborough. Realistic estimate is 17.5 hours. Best case 15 hours, worst case 20 (or not finishing). Training has gone well so far, though, I've done up to 5,600 m of ascent in one ride, so feeling fairly optimistic!