As I read it, public parks that are open access are exempt from the act. https://www.gov.uk/government/publications/terrorism-protection-of-premises-act-2025-factsheets/terrorism-protection-of-premises-act-2025-scope-premises#:~:text=Parks%2C%20gardens%2C%20recreation%20grounds%2C,they%20are%20generally%20open%20access. "Parks, gardens, recreation grounds, sports grounds and other open-air premises used for recreation, or leisure are generally excluded from the Act’s provisions. However, this exclusion only applies where they are generally open access. If such premises have measures in place to secure or check that access is restricted, they would not be excluded premises and may be within scope of the Bill. This includes where a payment is made, a ticket or pass is issued, or where individuals are members or guests of a club, association or similar body to gain access (e.g. a members access only tennis club). "If measures are in place for particular facilities on premises, but those measures do not limit access to the premises more generally, then they can be disregarded. For example, a charge for tennis courts in a generally open-access park."
Steven Toft ● 22d