Installed wrong time zone and language

[jackisbadatbuilding]

i accidentally installed the us time zones and language (what a fail)

i have changed everything in the time and date settings but i still get the wrong time zones ,
utc +1 etc
i want my gmt bacK can someone help pleaseeee

 

[Dark Lord of Tech]

http://www.sevenforums.com/tutorials/944-time-zone-change.html