When I was an engineering apprentice in the late '70s, and on day-release at Chesterfield College, or "The Tech" as it was in those days, Trebor Works was only a few hundred yards away, across the railway lines. (The A61 bypass now follows the line of the old railway cutting).
When the wind was in the right direction the sickly sweet smell from the works was overpowering. But worse, you could always tell when it was "mint day", and they were boiling up the syrup for Trebor Mints, by the sugar smell being replaced by the stink of peppermint oil, so strong that even on hot summer days we kept the classroom windows shut just to keep it out. Even then the smell could make your eyes water and make you feel sick.
By a strange coincidence, some years later, I ended up working for a company that made ingredient measuring equipment for the food industry.
One of my occasional jobs was servicing the mint-oil dosing pumps at Trebor. Yuck