After gaining 100 + hours P1 on type you can apply to become an AFI which requires you fulfilling a course and passing the exams. My friend did his AFI course in Portugal, which took about 3 weeks, and cost approx 3k I think!! But don't quote me.
Then once sufficient hours acquired as AFI I believe you can take it to FI status. But, as says above - BMAA are best point of info!
