https://www.legislation.gov.uk/uksi/2021/1338/contents/madeEnter
The key part he is about self isolation for those who have tested positive, those who have close contact with a person who has tested positive and children of those whom the above applies.
Face Coverings – What are the punishments for non-compliance? People who are not wearing a face covering where they have to can be fined in form of a fixed penalty notice and ordered to pay £200, rising to £400 for the second such offence, and to £800 for the third, up to a maximum of £6,400 in the case of a sixth and subsequent fixed penalty notices.
Where you will have to wear a face covering –
The new rule applies to: All public transport, including taxis and private hire vehicles, and transport hubs (airports, rail and tram stations and terminals. maritime ports and terminals, bus and coach stations and terminals) Shops and supermarkets and generally places that offer goods or services for retail sale or hire, enclosed shopping centres and indoor markets. Takeaways without space for consumption of food or drink on the premises. Premises providing personal care and beauty treatments such as hair salons, barbers, nail salons, massage centres, tattoo and piercing studios. Auction houses and retail galleries. Post offices. Banks, building societies, high-street solicitors and accountants, credit unions, short-term loan providers, savings clubs and money service businesses. Estate and lettings agents and retail travel agents. Pharmacies. Vets.
Similar if not the same to the last lot of face covering regulations. The list of reasonable excuses including suffering from a disability or experiencing “severe distress”, eating or drinking… appears to be not hugely strict.