After quite extensive discussion we have decided that the club should cease to schedule club runs until further notice.
Although it might be argued that relatively small groups meeting out of doors pose only a small risk of cross-infection, the Government's "Social Distancing" measures include "Avoid gatherings with friends and family". We felt we should not promote activities which are so directly contrary to Government advice; advice which applies to all - not just to those in the vulnerable groups.
Today Cycling UK, British Cycling, Cycling Time Trials and Audax UK have all cancelled their events. 
Having said all that, we would like to encourage all members to continue to ride their bikes. Gareth found a quote which nicely expresses this:
“In these unprecedented times, with complete uncertainty of the pathways ahead, we have a duty to look after one another and ourselves. With the outbreak of COVID-19 and the subsequent effects on our communities, now is the time more than ever to look after both your physical and mental health. If you can ride, then ride. Please do so responsibly, following all relevant safety guidelines, and with the full consideration of those around you. Stay safe, and stay positive.”