Lozzo,
Well done. I don't think we've heard of anyone not getting to Stage 2 because of their application form, so I think you're safe as long as you meet the basic requirements.
Previous experience: Now, I don't know much about the 'new' Stage 2, but it seems less personal than the old one (ie. no questions for you as a person, they're still only interested in your brain
), but if you make it to Stage 3, your interviewers will have read your whole application before they meet you, so it's in your interests to impress them as much as possible before you even walk through that door. Once there, they'll start to ask you about what you've done in the past and then start to pick it apart (well, they did for me anyway)!
Good luck and take your time with the application form - it's usually beneficial to get someone else to read your responses too before you send it off.