Updated handwashing advice
The most important thing individuals can do to protect themselves is to wash their hands more often. Soap and water and regular handwashing for at least 20 seconds is the best way of staying safe. Hand washing with soap employs mechanical action that loosens bacteria and viruses from the skin, rinsing them into the drain. Drying hands afterwards makes the skin less hospitable to the virus. Hand sanitiser can be effective if soap is not available or the situation makes using soap less feasible (i.e. when outside) but using hand sanitiser provides none of the virus-destroying friction that rubbing your hands together and rinsing with water provides.
Advice on supporting young people's mental health and wellbeing
Public Health England's advice on supporting children and young people's mental health and wellbeing during the COVID-19 outbreak:
https://www.gov.uk/government/publications/covid-19-guidance-on-supporting-children-and-young-peoples-mental-health-and-wellbeing/guidance-for-parents-and-carers-on-supporting-children-and-young-peoples-mental-health-and-wellbeing-during-the-coronavirus-covid-19-outbreak. This was published on 29.03.2020 and contains information on how children of different ages may respond to this situation, as well as on children who have learning difficulties and/or autism and whom may already be accessing CAMHS or similar.