The government's plan to rebuild document targets July 4th for the reopening of the hospitality and leisure sectors including food service providers, pubs, hotels, holiday parks, campsites, cinemas etc. If they're all fine to open why not zoos?
Appreciate it was published on May 11th and things are changing rapidly but it seems like there could have been government communication to those businesses in the last couple of days. Twycross isn't the first zoo in the last 48 hours to publicly criticise the governments change of plan and at the same time there are campsites and holiday parks who have opened up their booking systems and pubs & venues who have announced events for their reopening on July 4th.
In any case we know non-essential shops are reopening shortly, cafes are already open for takeaways and the current restrictions don't require public toilets to be closed. Not sure why it would be safe to go to the toilet at Ikea for example but not other public places?