Any experiences or wise words of advice?
It's to a school that is normally over-sub'd but unexpectedly had a place.
DS is finishing up y7 at a tiny private school & will start y8 at new school; I am apprehensive that transition won't go well because the school isn't used to catering for in-year transfers. They may assume DS knows how big secondary schools work, when he won't know at all.
I have nosed around to find out what bags the boys usually carry.
He is supposed to have a "buddy" (someone he already knows) to help him settle in. His buddy hasn't been confirmed yet, nor has his autumn time table, nor which set or "house" he'll be in. Not sure how they'll figure that out. 
Uniform I will get in the summer & we will have a practice of him getting up early & catching the right morning train & walking from station to school.