Fiona Spargo-Mabbs gave her son a kiss and a hug, and told him she loved him. Daniel responded by saying "I promise I won't die" before leaving the house and heading to a rave where he collapsed.
More top news
Police have stepped up patrols after a woman in her 40s was "dragged to the ground" in a park in east London.
Families living near Heathrow say they are supporting a group of activists facing jail for chaining themselves to the airport's runway.
Police were called to break up a "large fight" which involved a baseball bat, a man dislocating his shoulder and three arrests.