Mercury wasn’t poisonous, and Lucozade was medicine.
Apparently while setting up a display of old clocks, they dropped some mercury, and the fire brigade came out in full breathing kit. When I was at school I remember people making plastic key rings, and putting Mercury in them because it was ‘cool’
And when I was sick, you had to go to the chemist and buy Lucozade with the cellophane wrapper. and it did make you better. not like this modern muck.