Hey FB
I know they are busy calling around trying to follow up on peoples reference checks, criminal history etc. so they may be a while in getting back to you... but dont worry!!! easier said than done I know!
In answer to your question they contacted one of my referee's before they called me and the second one they called after, so i spose that doesn't help much..
Try not to agonise over your interview.. it will only make you age quicker
...
Send me a pvte msge if you like and I'll e-mail you.
Regards
Paully