Thank you Timetraveller. I am aware of entering a new phase of parenting, supporting an (almost) adult child, whilst encouraging them to be independent and to take responsibility.
Oddly poignant for me as I now have Power of Attorney for my mother, and so as DC prepare to leave home my focus is shifting.
It is lovely to see my DC develop dreams and ambitions of their own. Part of it though will be for them to cope when things don't go exactly according to plan. Slightly easier for us in that DS did unexpectedly badly in a single AS paper. The remark took him up a grade, not the two that he might have hoped for. No Jan resits so he will take it again in the summer. He probably wont need that subject for a Cambridge offer, though he will elsewhere. However so many candidates will be presenting perfect A/A*s that Cambridge is now a bit of a long shot.
These things happen. Approach now is for him to apply for five quite competitive courses and see how he gets on. He will probably need to do a Masters anyway so would prefer not to take a gap year, but if he does he will hopefully have a good resit and have achieved his predicted crop of good A2 grades.
(As an aside I am curious about the impact the cancelling of the Jan resit will have on applications. My son cant be the only one in this position. His cousin has just started medical school with AAAA but achieved by re-sitting four or so exams. Presumably in future the similar candidates will be presenting with a much more patchy set of grades.)
DS has been quite course focussed and his chosen Universities will provide quite different life experiences. Two (London) are within walking distance, whilst another is campus, and the fifth a city. I sense that as with BeckAndCall's DC, he will be happy wherever he goes and decide in retrospect that it was the right decision.
Unfortunately all have a reputation for offering late, so UCAS is on a back burner in our household. A good chance to focus on A2s, though a bit miserable as his friends are starting to get offers.