This update from British Cycling.
The full guidance is available at. https://www.britishcycling.org.uk/about/article/20200512-about-bc-news-British-Cycling-Updated-Coronavirus-Guidance-0
What is the current state of play for clubs, groups and British Cycling recreation programmes?

Club, group and recreation programme activities can resume in England, and should still be limited to six riders. All participants should ensure that they comply with relevant travel guidance, which can be found in the question above.

Clubs and groups are now able to ride ‘one metre plus mitigations’ apart in all circumstances, rather than having to maintain a two metre gap. The ‘mitigations’ listed by the UK Government include being outdoors and being side-to-side (avoiding face-to-face contact), both of which are achieved in group riding.

Multiple groups of six are permitted to begin their rides at the same location, however groups should be kept wholly separate, start times should be staggered and they should take different routes if possible to prevent groups from merging together during the ride.

Social interaction before and after group rides should be extremely limited and only take place in line with legal gathering limits and other relevant restrictions. Groups from ‘Medium’ (Tier 1) or ‘High’ (Tier 2) areas should not stop for a break while in a ‘Very high’ (Tier 3) area, and groups from ‘Very high’ (Tier 3) areas should not stop for a break outside of their area..

So club runs can resume pretty much the same as we were before the lockdown . Groups of no more than six . Muster separately but this time no coffee stops.
It is important that we are seen to muster separately so please keep to your ride group.
If this doesn’t work satisfactorily. I may have to consider a booking system or separate departure points.
I’ll post a route of around 40 miles with no stop

As a British Cycling member, what does this mean for my third-party liability insurance?

British Cycling’s third-party liability insurance and legal support and advice member benefits remain in place for all Commute, Ride, Race Silver and Race Gold members.

Those riding in groups which comply with Government guidelines (see above) will be covered, but please note that insurance cover provided to members and Clubs will be invalid if they are wilfully contravening Government advice – ie. riding in large groups of more than six – or participating in activities which are currently suspended.