When did britain's first comprehensive food and drug act pass?

The first laws that penalized food and drug adulteration is the The Adulteration of Food and Drugs Act 1860, which was later revised in 1872, and the Sale of Food and Drugs Act 1875. Adulteration was a thing before, but it caused illnesses to many workers that the industry people have to pressure the government to pass anti-adulteration laws to reduce absenteeism of their workers. The laws outlawed a lot of adulteration practices and also made provisions for appointments of public analysts to inspect food and drugs.

The British Parliament first passed a comprehensive food and drug act in 1875. The basic food law was known as the Sale of Foods and Drug Act. Many of the other European countries then followed suit and had their own food laws before the end of the century.