A country estate near Northampton has apparently been moonlighting as a pharmaceutical production facility, becoming the site of the largest ever seizure of unlicensed weight-loss medicines in the UK. Two 29-year-old men were arrested during a raid by the Medicines and Healthcare products Regulatory Agency (MHRA), which recovered about 12,000 doses of unlicensed weight-loss drugs.

Law enforcement officers uncovered what they described as a large-scale facility used to manufacture, assemble, and distribute unlicensed products including retatrutide (an unlicensed weight-loss drug), tirzepatide (sold under the brand name Mounjaro), and other peptide-based medicines. Andy Morling, head of the MHRA's criminal enforcement unit, said the operation demonstrated the agency's “unwavering commitment to ensuring there is no hiding place for those who cynically put the public’s health at risk for profit.” He added that dismantling the illicit production facility “will have prevented significant public harm.”

The property was raided on 28 May with support from Northamptonshire police. Investigators believe the country estate was being used as a large-scale site to manufacture, assemble, and distribute the drugs. Officers seized substantial quantities of packaging materials along with what are believed to be pharmaceutical substances used in the illicit production. This follows a November 2024 warning from the MHRA that organised crime gangs had begun manufacturing their own branded weight-loss drugs designed to resemble legitimate medicines. The first raid on an illegal weight-loss drug factory took place in Northampton in October 2025, during which the MHRA seized thousands of empty weight-loss pens, raw chemical ingredients, and more than 2,000 unlicensed retatrutide and tirzepatide pens. No arrests were made in that operation.