Supply teachers are hardly ever employed by schools now that most schools are using UNQUALIFIED staff as cover "teachers"! Hence your first question seems unreal and even patronising. So many well qualified, registered teachers with QTS are now unemployed. There must be hundreds if not thousands of fully qualified teachers now unemployed, many of whom are completely disillusioned and demoralised. Undoubtedly it is easier to use bogus, unqualified staff as "teachers" in the primary sector and one would expect it harder for schools to get away with employing unqualified staff when a secondary subject specialist is needed but...??? it happens One advertised vacancy may well attract thousands of applicants??!! In a fair, just and honest world of employment, a well experienced supply teachershould do well but...with so much prejudice, corruption and exploitation even teacher assistants are now being employed as "teachers".The whole teaching profession is now broken, devalued and the notion of QTS made a complete mockery! UNBELIEVABLE IF NOT TOTALLYUNACCEPTABLE.