We were first inspected as a GCP compliant testing laboratory in 2016 and our subsequent inspections by the MHRA include an ongoing assessment of compliance in this area.
In the absence of definitive and clear regulatory GCP guidance for contract testing laboratories we have adopted the same principles for GCP testing as for GLP testing, albeit with the emphasis more on patient confidentiality and dignity. See the White Paper we have published outlining the process of introducing GCP to a GLP compliant laboratory.