"When circumstances change, I change my decision."
I hope that the Audax UK board will revise forwards (to 18 July) the resumption date for encouraging and validating rides, given the revision to the guidelines in England announced just now (Tuesday 23 June). We can surely rely on the prudence and self-discipline of riders to minimise the risk to themselves and others. Any risk to the reputation of Audax UK and to cycling in general is surely illusory.
The various home nations will be most likely to make similar judgements and take similar decisions in the next fortnight so the argument that Audax UK has to wait, wait, wait for all home nations to align before resuming is surely weakened. Of course local laws and guidelines varied with time/date would remain to be adhered to.
Individuals will have different approaches to the minimal risk that outdoor activity - specifically long distance cycling - incurs (to themselves and others). And they will choose to ride: at all, short distances, long (day) distances, alone, in pairs, in groups of 'x' - or not: individual decision.
Given Audax UK's objective of encouraging long distance riding, it does not need to apply additional, cautious restrictions on such activity.