The hidden menu options are identical to the HDR-FOX T2 including all the country options.
However, I thought that changing this on a HDR-FOX T2 alters the frequencies that the PVR can use for channel tuning. IIRC someone posted from Australia that they set it to Germany to change the frequencies.
Also dosn’t the time zone come directly from the TV signal and is therefore unchangable unless you change the aerial signal?
Edit: It looks like changing the country will change the time zone
http://hummy.tv/forum/threads/international-users-thread.1190/.
But if you are managing to pick up a UK transmitter you will need to change it back to England when ever you need to retune.