I always wondered why, when I lived in England, every public service seemed to take more effort than required. This answer seems as legitimate as any other (From the Independent):
Cocaine use in the UK is now so common that traces of the drug have contaminated the drinking water supply, a report has shown.
In a study to assess the dangers from pharmaceutical compounds appearing in the water we drink, scientists discovered traces of cocaine after it had gone through intensive purification treatments.
Experts from the Drinking Water Inspectorate found supplies contained benzoylecgonine, the metabolised form of the drug that appears once it has passed through the body. It is the same compound that is looked for in urine-based drug tests for cocaine.
Now I know why the term “Your Highness” is so popular in London.