How do you exit from Vi mode in Kate?

[Gary Dale <garydale@torfree.net>]

There seems to be a combination of keystrokes that I accidentally hit 
from time to time that puts me into Vi mode. Now I've nothing against Vi 
but if I wanted to use it, I have the real thing (well Vim anyway) at 
the command prompt. Unfortunately once in it, I can't figure out how to 
get out of it short of exiting Kate.

Any suggestions?