Some money.. usually not more than 30 pounds
1 credit card
1 ATM card
1 UK driving license
1 expired indonesian driving license (hmm.. I really need to throw this one)
1 Tesco (supermarket) clubcard
1 Picture House (cinema) member card
1 Snooker club member card (don't ask why I have this one if I don't know how to play snooker) 
1 1st class stamp booklet
1 Nando's official hot lover card (2 more stamps for a free whole chicken!!!)
1 National Insurance card (= social security card)
1 Local bus timetable