What is the new quarantine policy in the UK?

The policy is as follows:

From 4am on Monday 4th October 2021, international travel rules to England will change from a red, amber, green traffic light system Changes to a single red list of countries and simplified travel measures for arrivals from other parts of the world.

At the same time, the British government is planning to cancel the policy of mandatory quarantine in designated hotels for travelers from "red list" countries/regions, and will allow these arrivals to quarantine at home or at their own booked accommodation.

Introduction:

The United Kingdom of Great Britain and Northern Ireland (English: The United Kingdom of Great Britain and Northern Ireland), referred to as "UK". The British Isles, located northwest of the European continent, is surrounded by the North Sea, the English Channel, the Celtic Sea, the Irish Sea and the Atlantic Ocean.

The United Kingdom is an island country in western Europe composed of England, Wales and Scotland on the island of Great Britain, Northern Ireland in the northeastern part of the island of Ireland, and a series of affiliated islands. In addition to the mainland, it also has fourteen overseas territories. The total population exceeds 66 million, of which the English (Anglo-Saxons) are the main ethnic group, accounting for 83.9% of the country's total population.