In reply to tallpaulselfridge:
Thanks very much for your concern - it's much appreciated.
The plan was always to camp out overnight on the mountain somewhere, possibly near the CIC hut for an early start. It was more a question of whether the Ridge is too exposed and whether there is anywhere that's wide enough (as one commentator kindly put it above, as wide as my mum's back door).
So I guess it's a question of whether to do it in one day, beating the queues by camping at the bottom and starting bang on first light, or whether it's better to wait until queues at the start of the route die down, do the first half after lunch, and the second half the following morning.
No stranger to bivvying in the snow and high winds, if that was your concern. I was just leaning towards staying overnight on the Ridge specifically, to give it more of an alpine feel