if you look at from NHSdirect side you would listen to the clls the patients make to them.. I have just done the same for SAS calls from NHS24. e.g. having listened to the recording the patient clearly stated on the call of 22.30 monday night had gripping central chest pain . going through to his left arm and up left side of neck.. and yes he was nauseated and sweaty +++ 999 ambulance requested rightly by the nurse advisor. However, when SAS arrived and report the patient stated no nausea or central chest pain NIL ecg changes on arrival denied agreeing to ambulance dispatch. And apparently stated to SAS crew though had indigestion, Do you notice the trend here.... PATIENTS LIE !! Incidently it turned out on follow up with a Glasgow Hospital the following day ( after SAS had felt transport to hospital not neccessary and NHS24 over reacting!!. A GP had arranged admission and the said patient had had undergone ANGIOPLASTY and 3 Stents had been inserted at the W.I.G. ) think on!!!