The Terrorism Act 2000 (Proscribed Organisations) (Amendment) (No 3) Order 2021 adds Harakat al Muqawama al-Islamiyya (Hamas) to the list of proscribed organisations under the Act. It is a criminal offence for a person to belong to, or invite support for, a proscribed organisation. It is also a criminal offence to arrange a meeting to support a proscribed organisation; or to wear clothing or carry articles in public which rouse reasonable suspicion that an individual is a member or supporter of a proscribed organisation.
https://www.legislation.gov.uk/uksi/2021/1318/contents/made
https://www.gov.uk/government/news/islamist-terrorist-group-hamas-banned-in-the-uk
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