I can't work it out from the roadmap.
12th March = Childcare and children’s supervised activities can also resume where necessary to enable parents to work or engage in similar activities. This suggests to me that it is just for wraparound care purposes.
12th April - Indoor leisure facilities such as gyms will also reopen (but only for use by people on their own or in household groups) No mention of children's group activities.
Then:
17th May - indoor adult group sports and exercise classes The fact that adult is specified suggests to me that children's activities will be already open at this point but I can't see anywhere that it specifies this.
Have I missed something, or is it looking like 17th May?