FI(A) Renewal
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For the holder of a FI(A) to renew the rating they shall complete items b) & c) as for revalidation within the last 12 months before renewal.
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For a FI(A) rating that has expired by more than 5 years, application should be sent to PLD for endorsement together with the appropriate fee as per Scheme of Charges. In addition, applicants will also be required to submit completed form SRG\1153 to demonstrate to the satisfaction of the Authority that knowledge of the relevant parts of JAR-FCL and JAR-OPS has been acquired.
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An existing FI who has not previously passed CPL level examinations whose FI rating has expired by more than 5 years will be required to pass the JAR-CPL theoretical knowledge examination before the FI rating can be renewed.
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Not a lot to go by, but since you have been in current flying practice you should be ok on the JAR stuff and there will be no need to do any exams again.
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Looks like you need to find an FIE, do whatever training he/she deems required, pass the test and attend one of those instructor seminars. Oh, and pay the CAA some money.
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Download LASORS
here.