Environmental Monitoring & Process Validation Specialists. Cherwell Laboratories was founded by Lawrence Whittard in 1971 as a veterinary diagnostic laboratory. Today, the business is a specialist supplier of products for environmental monitoring and process validation for healthcare, pharmaceutical and industrial applications. From our site in Bicester, we manufacture Redipor® Prepared Media, our own range of microbiological media products which has been developed to meet the specific needs of our customers. We also supply SAS® and ImpactAir® microbial air samplers. Our Ethos Cherwell focuses on supplying high quality and bespoke products supported by excellent customer service.