Those arriving into the UK from abroad will now be required to self-isolate for 14 days as new quarantine measures are introduced from today - June 8.
However, there's a large list of people who are exempt from the new measure due to the nature of their work.
The government policy has been put in place to prevent a second wave of coronavirus hitting the UK, and as the Home Secretary states, it's "essential to save lives."
However it's faced huge backlash from the airline industry with the parent company of British Airways launching legal action against it.
From Monday, all those coming into the UK will have to fill out a form providing their contact and travel details, as well as the address of where they will be in quarantine.
Those who fail to comply could be fined by up to £1,000 in England.
While there are exemptions for certain individuals, people isolating for two weeks will still be allowed to leave their house for limited reasons.
The Prime Minister's official spokesman said he thinks there will be some exceptions, like at the start of the nationwide lockdown.
He said: "For example I would expect people only to be able to leave the property in which they are quarantining if they need urgent medical treatment, support from social services, food or medicine which they cannot get delivered or get anybody else to bring to them, an emergency in the place they are staying – such as a fire – or to attend a funeral of a close relative."
The list of those exempt from the new quarantine rule is extensive, and there are certain requirements they have to fulfill to enable them to not have to isolate for 14 days. Some also depend on which devolved nation they are travelling to.
This is the full list:
Travellers from within the Common Travel Area (Ireland, Isle of Man and Channel Islands)
Members of diplomatic missions and consular posts in the UK, officers, servants or representatives of international organisations, representatives at an international or UK conference granted privileges and immunities
Representatives of a foreign country or territory and representatives of the British overseas territories travelling to the UK to undertake official business with the UK
Defence personnel, visiting forces and government contractors who the Ministry of Defence has confirmed are required to deliver essential defence activities
UK officials and contractors required to work on essential border security duties
Non-UK officials and contractors required to work on essential border security duties
Crown servants or government contractors travelling to the UK for essential government work
People who live in the UK but work in another country and travel between the UK and country of work at least once a week
People who live outside the UK but work in the UK and travel between their country of residence and the UK at least once a week
Drivers of goods vehicles or public service vehicles and other employees of community licence holders for the international carriage of goods or passengers by coach and bus
People transiting airside (individuals who arrive in the UK but do not pass border control)
Civil aviation inspectors engaged on inspection duties
Eurotunnel train drivers and crew, Eurotunnel Shuttle drivers, freight train drivers, crew and essential cross-border rail freight workers operating through the Channel Tunnel
Drivers and crew of trains operated by Eurostar International Limited, essential cross-border workers working for Eurostar International Limited
Operational, rail maintenance, security and safety workers working on the Channel Tunnel system
Workers engaged in essential or emergency works to the rail network as part of a specialist team with or for Network Rail
Seamen and masters as defined in section 313(1) Merchant Shipping Act 1995, maritime pilots as defined in para 22(1) of schedule 3A of the Merchant Shipping Act 1995, and inspectors and surveyors of ships appointed under section 256 of the Merchant Shipping Act 1995
Pilots and crew, as defined in paragraph 1 of Schedule 1 to the Air Navigation Order 2016(h), where such crew have travelled to the UK in the course of their work
Workers engaged in essential or emergency works, related to water supplies and sewerage services
Workers with specialist technical skills for essential or emergency works or services (including commissioning, maintenance, and repairs and safety checks) to ensure the continued production, supply, movement, manufacture, storage or preservation of goods
Workers with specialist technical skills required for essential or emergency works (including commissioning, maintenance, repairs and safety checks) or to fulfil contractual obligations or warranty specifications in, or in connection with, waste management facilities used for the management, sorting, treatment, recovery, or disposal of waste (including energy from waste)
Workers with specialist technical skills required for essential or emergency works to ensure the continued safe and secure operations of generating stations, gas or electricity transmission or distribution networks, electricity interconnectors, gas terminals or district or communal heat networks
Workers required for the continued safe and secure operation, maintenance and essential support services for offshore oil and gas infrastructure in the UK
Workers with specialist technical skills required for essential or emergency works to ensure the continued safe and secure operations of space infrastructure
Nuclear personnel who are essential to the safe and secure operations of a licensed nuclear site
Nuclear emergency responders
International nuclear safeguards and chemical industry inspectors, representing the Organisation for the Prohibition of Chemical Weapons (OPCW), International Atomic Energy Agency (IAEA) and Euratom
Specialist aerospace engineers, or specialist workers responsible for ensuring the safe operation of aircraft.
Workers with specialist technical skills required for essential or emergency works to ensure the continued safe and secure operations of a downstream oil facility that has a capacity in excess of 20,000 tonnes
Postal workers involved in the transport of mail into and out of the UK
Individuals arriving to attend pre-arranged treatment, when receiving that treatment in the UK
Registered health or care professionals travelling to the UK to provide essential healthcare, including where this is not related to coronavirus
If you’ve travelled to the UK for the purpose of transporting, to a healthcare provider in the UK, material which consists of, or includes, human cells or blood which are to be used for the purpose of providing healthcare
Qualified persons and responsible persons for human and veterinary medicines, clinical trials, clinical investigations and pharmacovigilance
Quality assurance inspectors for human and veterinary medicines
Sponsors and essential persons needed for clinical trials or studies
People involved in essential maintenance and repair of data infrastructure required to reduce and resolve outages, or in the provision of goods and services to support these activities
Information technology or telecommunications professionals whose expertise is required to provide an essential or emergency response to threats and incidents relating to the security of any network and information system and ensure the continued operation of any network and information system
People engaged in urgent or essential work on electronic communications networks
People engaged in urgent or essential work for the BBC’s broadcasting transmission network and services
International prison escorts, designated by the relevant Minister under section 5(3) of the Repatriation of Prisoners Act 1984(a)
The list along with the requirements are found on gov.uk here.
