From the CUK website

England

There is no limit on duration or frequency of exercise; however official advice remains that you should stay at home 'as much as possible'.
You can travel any distance in order to exercise.
On Thursday 28 May, Boris Johnson, announced that from Monday 1 June in England up to six people will be allowed to meet outside, provided those from different households continue strictly to observe social distancing rules by staying two metres apart.
Government guidance published on Friday, 29 May has not yet reflected this change, maintaining that for the purposes of exercise you are still allowed to meet with only one person who is not a member of your household, provided social distancing is maintained.
Cycling UK will continue to monitor developments and currently advises that in England exercise is only taken alone, with members of your household or with one person who is not a member of your household, provided social distancing is maintained.


CUK website

Tony..