Check for any dangers to yourself- never put yourself at risk
Shout for help and, if safe to do so, check to see if the collapsed person responds to being shaken (by the shoulder) and is breathing normally (see Vinnie Jones YouTube clip)
If not, call for ambulance immediately (999), before also informing University Security on 3333)
Get someone to fetch the defibrillator located near Biology Reception
Call for a First Aider to attend
First aiders can deliver CPR- including mouth-to-mouth ventilation
Start CPR without delay
Use the defibrillator without delay when it arrives