Thanks for your replies.
Yeah 'abc1' is right - I rang HR and they said you can re-apply a year from when you first sat the tests.
I'm pretty chuffed about that, I thought it was a year from when you found out that you fail, so I'm going to get my application form back into the system again. Its going to be a long hauler but things come to those who wait! ...or so I'm told!
Thanks again!