Quickdraw did it.
He has it on his 2 ltr k10.. ill see if i can find the page were i was reading it. Think it was on the almera owners club!
But it might have been on here, it was a while ago though!
Edit: found this on a quick search on here.
http://www.micra.org.uk/showthread.php?t=791&highlight=quickdraw
Has some information but i can actually find the one with pictures though!
It also mentions it in Dbull's thread, there is apparently a guide but im not a member so dont know this to be true or not!

http://www.micra.org.uk/showthread.php?t=1588&highlight=brake+upgrade