Jimi wallet with debit/building soc. cards, folding money, Oyster card and security door pass card for work; a couple of big felt markers; small leather drawstring pouch for loose change; Rolson folding utility knife; iphone; couple of pairs of earphones, (cheap ebay Apple EarPods knock-offs and my Etmotics with custom eartips for when I have to use noisy machines); keyring with small Fenix torch, alloy case with earplugs for gigs, door key modded to use as bottle opener, 16Gb FlashDrive, miniature prybar and bike lock key; Wilco lip balm, tissues, small plastic folder with microfibre cloth and lens wipes for glasses; couple of small penknives.
Ex Danish Army combats are great with lots of pockets for carrying junk in!
Oh, and a nice big bright flashlight in a belt sheath.