Stropps, do you think it's possible DD overshot a bit, in her swing towards knuckling down, then had qualms about whether she can do it and overshot the other way?
Can't think which cluster h/a meds would preclude driving, though she obviously shouldn't drive during a cluster. Sorry if I've missed this but is the diagnosis firm? CCGs will not pay for referrals unless they meet strict criteria, which vary a bit from region to region, but most neurologists would see a 17 y.o. with cluster h/a. And you're right, during a cluster the meds should be injected or inhaled, not oral.
I'm currently on a panel for a serious incident inquiry. Profoundly depressing. Most of what went wrong is directly related to benefit cuts 
DD has been asked to give a speech at Open Day because the entire Head Girl team is away at a conference. Is she being groomed, d'you think?
On the party front, I succeeded in nailing a couple of bits of jelly to wall tonight
. Good point about clear timings, Rose, going to use that. Also going to be Very Firm about dogs - if mine has to be boarded out for the w/e, so does everyone else's.