The Scottish Executive adopts a precautionary principle where hazards and the risks of these being realised are concerned.The Scottish Executive takes advice on this from the National Radiological Protection Board (NRPB), which is, in turn, advised by its Advisory Group on Non-ionising Radiation, chaired by Sir Richard Doll. NRPB staff are in continuing contact with similar bodies worldwide.The NRPB's advice indicates that the field strength of signals from mobile telephone masts at places to which the public have access are much below recommended guideline levels and should present no hazard to health.