Excellence in Analytical Chemistry Since 1974 With 40 years experience, Butterworth Laboratories remains a fully independent UK contract analytical service providing Quality Control Testing, Method Development & Validation and Stability Study Storage & Testing to the pharmaceutical and related industries. We work in partnership with our clients who not only recognise our expertise in analytical chemistry and standards of service but also value our integrity and impartiality. Our regular inspections by the MHRA, UKAS and FDA ensure that the service you receive is at the very highest level for testing, validation and analysis.