Back in the 1960s, it was finally agreed that our CCF's ancient 'Switchboard, Universal Calling, Ten Lines' which dated back to the First World War would be replaced by a more modern 'Switchboard Magneto Ten Lines Mk2' of either Second World War or Korean war vintage. It was much smaller than the old UC10.
At about the same time, the physics syllabus was updated to include the study of radioactivity. This included a number of low grade radioactive sources and a Geiger counter, to demonstrate the effect. The sources came with dire instructions and were always kept locked away.
New toys were often demonstrated on Speech Day, as was CCF equipment. A physics master happened to be passing our 'new' SM 10 Mk2 with the Geiger counter in his hand when it went nuts. The readings were much higher than anything obtained from the official radioactive sources!
It was later discovered that the the SM10 had luminous labels next to the jack sockets, so that it could be used in the dark; these things were highly radioactive and an urgent call went out from Blandford for all such items to be returned asap.
I wonder whether they are quietly irradiating some buried site deep in the rural countryside?