In reply to SteveoS:
> I was wondering if anyone has any pearls of wisdom or gone through the same process?
Don't be overtly competitive, don't get stroppy, and avoid winding people up.
Group interviews are about seeing you how you act and interact with other people. You need to demonstrate you can disagree with someone without being arsey, that you can persuade people they're wrong without them getting the hump and without you appearing to be in it to score points.
You'll need to show you can sell things - ideas as much as items - by being positive.
Don't interrupt people when they're speaking, even if they're talking bollocks. Stay calm and positive, take your time and try to behave in the way you would expect to treated in a shop as a customer.
If someone asks what you think is a stupid question, don't be afraid to ask for clarification, and if someone asks you something to which you don't know the answer, don't make up an answer to fill the space - be honest.
Good luck!