Our North, East, Central and West London Clinics are run by healthcare professionals who are experienced in sampling and testing for COVID-19.The RT-PCR Swab test is the most accurate test available and it is accepted by every country and airline. You will receive a Doctor-signed Fit To Fly certificate and lab report by midnight on the same day. For a test to be accurate it must be carried out in a clinical environment. Self-administered home tests can lead to a risk of sample contamination.