UKAS stands for the United Kingdom Accreditation Service. It is the only government recognised national accreditation body in Britain. It has been designed to evaluate the competence of all organisations that supply services relating to certification, calibration, inspection, and testing.
This gives you ultimate peace of mind. The same cannot be said for those without UKAS certification. It is true that their prices may be lower in some instances, but this is because they are not bound by the same strict guidelines. Nevertheless, this means that you are taking a massive risk, as the quality of product testing and auditing quality may vary.