The hack that is for the wharfedale M3 works but the way to get to it is to go to the password page on setup as follows
OPEN DISC TRAY
CLICK SETUP ON HANDSET
RIGHT BUTTON three times (i.e. to the password settings)
TYPE 49540
You will then get a grey box that says region 2 - you can scroll this up and down to any of the 6 regions including region 0 for multiple region
then press PLAY
and the new region has been selected - Some people have reported them being multi region out of the box anyway even thought it says region 2 but maybe it just plays all types anyway:)
H