Ah, yeah. At the World Championships, the debating style used is basically the format used in Australia and New Zealand - British Parliamentary can be quite abrasive and has a 2 team vs. 2 teams format, rather than 1 vs. 1 team format, so while it is the format you will see in the Oxford Union, on an international scale it isn't used. I actually prefer the World's/Australian format - the longer prep time means you have a greater opportunity to establish strong ideas, and third speaker in World's/Australian format is the best position in any format (it's just an excuse to run rampant through the entire argument with a metaphorical shotgun). That position doesn't exist so much in BP, although 4th has some similarities. You should try for the Australian team, for World's - Australia has the most all time wins and is usually really successful. I was on last year's Welsh team.