Some aftermarket lances come prefitted with Brand specific adapters. If you look at the link that Locke posted a bit earlier there is the option of choosingCheers bud.
B&Q also have two other K2 set-ups. Both more expensive than this. One has a load of attachments i wouldn't ever use......the other is this one:
http://www.diy.com/departments/karc...56_BQ.prd?GD_POWER_GRIDTITLE_CAT_PRESSUREWASH
^^^^^ And i can't see any difference between the £56 one and the first £40 one i linked too ?
My ultimate point is: Can i fit a Karcher attachment lance straight to the £40 kit and go ??
Or are there other parts i would need ?