Great thanks Pastille - the little sods are wrecking everything about them!
Favourite game so far is one of them taking the top tissue from the box, then the other grabs the next one which pops up.
I now have very little on my desk - most of it is on the floor.
If only I could get to grips with Dropbox I could post some pics but then again - I'd have Torquie (quite correctly) telling me to stop nattering!