Obviously there's the Haynes manual (even though it says it doesn't cover the C+C or facelift models alot of the stuff in it is universal to the K12...trims/lights/bumper/panels etc...)
available from Haynes site/amazon/Halfords etc...but until one pops up on ebay at a bargain price....
@Guy has a copy you can download (not haynes) from his website www.micrak12.com click on the very last full stop of the introduction paragraph