The government have given advice for the return to outdoor sports and recreation:
We are increasing people’s access to outdoor physical activity for the purpose of health and wellbeing. This includes use of outdoors sports courts and facilities.
You can only exercise alone, with members of your household, or with 1 other person from outside your household while keeping 2 metres apart at all times.
For example, this means that you cannot have 5 people from 1 household plus 1 person from outside the household playing sport together. But you can have 2 people, from 2 different households, as long as they are staying a minimum of 2 metres apart.