Please see Cycling UK’s latest guidance:
Coronavirus Q&A: Is it safe to cycle? and Why we had no choice but to advise against group rides.
In summary, with a few exceptions (detailed in the Q&A) yes, we should carry on cycling. However, the advice is clear and unequivocal on cycling in groups: you shouldn’t ride with anyone else, other than members of your own household.
York Wednesday Wheelers 