On 25th March 2020, the Resuscitation Council UK issued updated COVID-19 guidance for those who need to perform CPR in an out of hospital situation. They are urging people to familiarise themselves with these key skills in case they need to help a loved one in need.
The guidance advises: 
If someone is unconscious and not breathing normally, do not put your face close to theirs.  Call for an ambulance, and use a towel or piece of clothing and lay it over the mouth and nose.  Do not do mouth to mouth.  Start chest compressions and use a Public Access Defibrillator if available.