From your iGoogle Home page, enter this into the address bar:
>> http://www.google.com/ig/settings
From 'Language', select 'English (UK)'
Change NOTHING else
Press 'Save' button at very bottom of page

Alternatively,
Go to:
>> http://www.google.co.uk/ig
Sign out & then back in
Enter this in the address bar:
>> java script:_dlsetp('v2=0');
Save this page as your new homepage in Internet Explorer or other browser
>> Internet Explorer > from the menu > 'Tools' > 'Internet Options' > 'General' tab > 'Use current' button > 'OK'