Les
If you have a week to go the best advice is to get hold of a magazine from WH Smiths or the library if you are lucky. Something like the Spectator or Newsweek. Make sure you get the ones that cover the last years news. i.e. 2001 Newsweek.
The question from the board will be something like "How interested are you in keeping up with what is going on in the world?" followed by "How do you keep up with events?" Assuming you say how exciting these things are for you then they will ask " What has caught your attention overseas in the last year/couple of years?" followed by "and on the UK scene?"
You therefore need to have 4 or 5 big topics well researched in both areas. They will decide which they want to ask you about!!
Finally, do not be afraid to say when you do not know the answer.
Good luck.