Jumpjim - great to see someone who's been through it all on here giving advice and a view on what it's really like to be in the job.
Re your point about getting in as soon as you can - my apologies, I wasn't being as clear as I had thought in previous posts. My point regarding getting grades before applying was specifically aimed at
...for those worrying about being too young or not having sufficient grades...
Ie if you don't meet the criteria currently (like Davy07) then, whilst you won't be eligible now you shouldn't necessarily give up all hope for the future.
The requirements on grades etc appear clear cut