[sclug] Downgrading Debian?

[Will Dickson]

Hi all,

I have a debian installation that I upgraded from stable to testing in 
the usual way. However, I've since decided that this was the wrong thing 
under the circumstances - not that there's anything wrong with Testing 
per se, but the machine in question is a production server and ought to 
be running Stable, as a matter of policy more than anything else.

Is there an easy way to reverse this upgrade?

TIA

Will.