This is from the government FAQs
3.16 Can I play sport outside? Does this now need to be limited to 6 people?
You can play team sport in any number if this is formally organised by a sports club or similar organisation and sports-governing body guidance has been issued. You should only be playing team sports where the relevant governing body has published guidance on how to do so safely. For example, the English Cricket Board has published guidance here and the FA has published guidance here. If you are playing one of these sports informally, such as in the park or a private garden, there must be no more than 30 people involved (including participants, coaches, umpires, spectators).
Team sports that do not have approved guidance should not be played if you cannot socially distance from people you do not live with. Instead, people should train together and take part in activities such as conditioning or fitness sessions in groups of no more than six people (outdoors).
When playing sports informally with people you don’t live with, you must limit the size of your group to 6. It will be illegal to do so in a larger group from 14 September.
At all times, you should comply with COVID-19 Secure measures and limit social interaction outside of the sporting activity.
I think Glacinda is owed an apology!