erm, I hate to disillusion you, but secondary teachers don't always have better qualifications.
I trained as a secondary MFL teacher.
I had French A level (and a degree in other languages which were not deemed useful at the time - not standard European languages).
I had a 2 year, condensed teaching degree, the aim of which was to 'brush up' my French, and to also, in the year I spent at university (2nd year offsite in placement) 'bring me up to speed' in a second 'useful' language - in my case Spanish.
then, with one years' worth of learning, I was let loose on unsuspecting secondary Spanish students. alarming to say the least. (and tbh, i woudl not consider A level plus one year of 'brushing up' enough to teach secondary French either)
it is no wonder that MFL teaching/learning is in the state it is in in this country.