This has been useful, I was planning to go to the presentation in jeans, trainers...mistake obviously!
I will definitely be taking on the advice that you are all giving me, and the advice that you've given other people too...I'm going to have to start illiminating the irritating/bad habbits that I have now, because I can see that they may cause me problems (eg fidgeting and playing with zips and stuff)
Also, straight after my last post, I did a search (all by myself!) and found some useless information...my third search was more sucessful
next time I'll do it myself before I ask (and risk sounding like a lazy idiot!)
Thanks again for everyone who took the time to reply, it's really helpful