If anyone fancies downloading a small document ive made up with sample questions to prepare for stage 3 interview please clivk on the link below :-
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Scremaingcobra - This has been answered in several posts, myself included, you need a basic understanding of speeds, destinations etc... they wont ask numerous questions on specific details, but you will need to know them later on, so learn as much as you can. Also if you follow the link above there are some handy files ive uploaded that may help.
Good luck