It is not within the CAA's remit to provide educational qualifications. I think that so few instructors operate in a traditional educational environment that the demand has been low. Where flying courses have been conducted at Universities e.g. London Metropolitan (Guildhall) they have managed with existing aviation instructors.
In the early days of the CAA they offered to issue licences to RAF pilots but it was the RAF who turned down the offer as they were concerned about setting up an easy escape route.
All the recent concessions have been hard fought for by one or two dedicated people.