NX Healthcare provides COVID PCR swab test services in the UK. You can book an appointment online or by contacting them directly. They offer a variety of COVID-19 tests, including PCR tests and rapid tests, which can be taken at their clinics or through home testing kits. It's advisable to check with them for the latest information on testing availability and any requirements for the test, such as pre-booking or proof of travel.  Call 020 8168 7100 or visit https://www.nxhealthcare.co.uk/  for more information.