Where were you when this happened and what year ? - suspected heart attacks are no longer necessarily classed as code reds.
Plenty of confirmed cases out there of people lying in gutters waiting for an ambulance - like the poor fella knocked over in grangetown, my mates mum broken neck waited 8 hours - in the end they sent an ambulance from monmouth - that got lost going from cyncoed to the Heath or the 2 years who had a seizure and was totally unresponsive - no ambulance arrived at all.
Whoever it was on Cathedral road that got the 2 paramedic cars plus an ambulance must just have been lucky perhaps