Royal wedding: ten questions

I am writing this from Heathrow, on the way back the Washington to give my 5th Mellon lecture on Sunday. I did take a peek at a bit of the wedding coverage before I left. Let me say straight away:

If these are two young people wanting to tie the knot, then I wish them all the best.. and what follows is not mean to be mean spirited or churlish. Good luck to them.

And anyway thanks to them, I got to Heathrow in record time (1 hour and 10 minutes from Cambridge... as against close to 2 hours).

All the same... there are some of the puzzles I am left with after the tv nuptials

1) How come the great and the good of this country don't appear to know the words of "Jerusalem" without looking at their hymn sheets, and even then dont seem to be quite certain of how the words fit the tune..?

2) Who WERE the two grey nuns sitting next to the bride and groom right up at the chancel end of the Abbey?

3) Did anyone advise William that (as the daughter pointed out) the red uniform made a TERRIBLE match for his complexion on telly, at least. (More on silly uniforms below)

4) What were the ex-royals doing there, as if they had never lost their thrones? The king of Yugoslavia? Of Greece (didnt actually spot him, but I THINK he was on the guest list)? I can just about get my head around kings and queens, but not ones that have been thrown out. ("No king without a country" would be my rule for such aoccasion, and then you might be able to find a pew for Blair and Brown?)

5) Can the Church of England really go on with this terrible sexism? Good on her, Kate didn't promise tp obey ( I seem to remember that Fergie did.. am I wrong?). But there is still that terrible stuff about "what man gives away this woman..?'

6) Did Harry actually look a bit uncomfortable when the lovely Pippa put his arm into his? Twitter is full of the new romance, but I thought Harry was a slightly embarrassed "real gent" ...

7) What WERE those collars on the Ruritanian uniforms worn by the main players? (The husband calls them "Gaddaffi Costumes"?). Are they concealing braces.. in Prince Philip's case, maybe they are. (And why were even the page-boys in para military uniforms?)

8) Why did Cameron bottle out and not just turn up 'normal'; it pains me to say it, but Sam Cam looked about the best of the whole congregation -- and YIPPEE no hat.

9) How many of the people we saw on the front rows were actually plain clothed police... with machine guns under their frocks, and a special budget for hats to 'blend in'? Like the hatted woman in the front of the car taking Kate and Dad to the Abbey.

10) Quite how many of the audience (aka congregation) were from British ethnic minority communities?? Sure there were a range of foreign ambassadors and "heads of state" who were not white and blonde.. but of the rest?? I have just done a "conversation" with David Lammy in the Guardian about access to Oxbridge (should appear on Saturday: be kind) ... but looking at this, I though that "access to the Abbey" was a pressing issue too.

Maybe my puzzlement is partly my error. I chose to watch on BBC 1 on my laptop, but Ed Stourton on Radio 4 would no doubt have answered these questions.. especially the nuns. All further answers gratefully received.