To be added as I come up with them:
1) Was raised by two mothers in Fulham. They're still together, and he calls them Mum and Mother.
2) Huge football fan, follows Chelsea FC. Also likes cricket, but only Twenty20, because the other one's "dreadfully boring". Has a guilty obsession with basketball, even though it's "a bloody colony sport."
3) Wanted to be a chef.
4) Joined the British Army to serve as a cook, but ended up in Air Defence and then the unknown Spec Ops unit.
5) Final tour was one of the first deployed to Afghanistan post 9/11.
6) Has had one fiancé, a dozen girlfriends, and too many sexual partners to count.
7) Heterosexual, but tried sex with men a couple of times, just to increase his potential partner pool. Didn't take to it.
8) Has absolutely no interest in settling down with someone, other than for a cover story, but is open to the idea that it could happen one day.
9) Once thumb wrestled Prince Harry. Lost on purpose.
10) Has a fish named Churchill.
11) Unflinchingly patriotic, and would serve Queen and Country above all else, including, sometimes, the PM and Parliament.
12) Tried to act for a few years, but couldn't get any decent roles (despite sleeping with two producers... at the same time).
13) Climbed Mt. Everest. One of the members of the party mysteriously died on the way up. John comforted the tour leader, who was shaken to lose her first ever climber. They get together whenever she's in London or he's in Nepal.
14) Has a tattoo of a Tudor rose on his right buttock, which he procured while very drunk at the urgings of a very beautiful young lady named Anne.
15) Has tested with an IQ of 131, 167, 112, 99, and 155 depending on the test, his mood, and how attractive he found the proctor.
16) Speaks twelve languages. Thirteen if you count American as a foreign language, which he does.
17) Once competed in Sasuke, just for kicks, but didn't make it past the second round (ran out of time on the last wall lift).
18) Was childhood friends with the woman who became his fiancée. They were engaged for a year before she called off the wedding (which was going to be April 27).