Charlie Pridham wrote:

I help run a farmers market and the EHO's are not happy with herbs in oil
but I had no idea why! this may be a reason, some one out there must know?

Anaerobic conditions can allow botulism spores to grow. So that is almost
certainly why.
But they aren't much cop as EHO's if they are unable to explain their
reasoning to you.

(on the face of it the components sound innocent enough but together they can
be dangerous)

Regards,
Martin Brown