Nope - it was quite legal to use the school shortwave transmitter and receiver on the official frequencies assigned for use by the Combined Cadet Force and Army Cadet Force.
And the FM CB frequencies were also legal; 40 channels were approved in 1981 and another 40 a few years later. Although I do admit to setting up the antenna to cover the whole frequency spectrum approved for use in the UK before the lower 40 channels were released!
88s (no tongues!)