"... and to consult your own doctor:–
if a cough lasts more than three weeks,
if you should spit up blood,
if 'run down' or unduly tired, or
after influenza.
Please recommend this service to your friends"
From the Mass Radiography Service in 1959, on a printed slip notifying of a clear chest x-ray (for a recent arrival in the UK, so probably TB screening).