Not sure about this one mate,personally I would think no with those other tickets you hold. Nebosh and iosh h&s quals looks like you should be a tutor.
There are some common stuff that rise in my mind before giving you any suggestion –
There are various certificate courses available from NEBOSH but what you have from many.
The CCNSG Safety Passport Scheme offers three courses. For most I like to say that CCNSG courses can only be run by Approved CCNSG training providers and authorized tutors. Details of Approved CCNSG Training providers can be found on the CCNSG or ECITB website. There is nothing to say for pre-required qualification for doing CCNG training.