As an AFI or as an FI(R), your instructing activites must be supervised by an FI(A). Ask your supervisor to help you, I would suggest - or an FIE. Have you met the 'declaration of knowledge' requirement so that you may instruct for the new PPL? If you only do a little instruction you may find it expensive to revalidate as you'll have to do the revalidation flight test AND the 2-day seminar.......... Best of luck, sorry that I haven't got the answer you need. Perhaps you should phone CAA Standards Support??