If you are running a business today, the Holidays Act 2003 is still the leave law you need to follow. The Employment Leave Act 2026 has been enacted, but its main framework does not generally start until 6 August 2028 and, in most cases, the current law continues until the first pay period starting on or after that date under the transition rules.
That means annual holidays, sick leave, public holidays and alternative holidays should still be managed under the Holidays Act until the legal transition point arrives.