Jersey moves to Guernsey's watchlist as cases there reach over 100

This means if cases continue to rise, the sister island would move to the most restrictive travel measures and anyone arriving from Jersey will be required to self-isolate for the full 14 days.

At the end of last week, health officials in the island warned that Jersey was at a 'critical point' and islanders were running out of chances to avoid a UK-style second lockdown.

For the first time since the initial wave Jersey has exceeded 100 known active cases and health bosses said that unless action was taken now and people adhered to safety measures, severe restrictions will be unavoidable.

Masks must be worn in indoor public spaces and physical distancing should be practised where possible.

Chief Minister John Le Fondré warned that too many were not following the rules and that continuing to do so might lead to another lockdown.

He said: 'I want us to avoid draconian measures. We will not reintroduce any restrictions lightly. But we will act swiftly and in a targeted way if necessary.'

Deputy medical officer of health Dr Ivan Muscat pointed out that the ‘dynamic nature’ of the virus, with cases coming and going, made it impossible to estimate how many undetected cases there were.

But the emergence of clusters of cases, particularly among children and young adults, was a worrying sign and new cases have been reported among sixth-formers.

Several cases could also be tracked back to Halloween parties and a specific warning was giving to Jersey's young people, saying although they may not have symptoms they could infect someone that will.

'Please think how devastating it would be for you, and your family, if you were to infect your grandmother or grandfather and, worse still, lead to their deaths,' the chief minister said.

Scottish islands including Orkney, Shetland and the Western Isles hace all seen an improved rate of infection, meaning they have moved from category three to category two.

Arrivals from a country with a low prevalence rate of between zero and 30 cases per 100,000 of population fall into category two. They can enter Guernsey and, provided they take a test on arrival, they would only be required to self-isolate until they receive a negative result.

Once that negative result is confirmed, they are in 'enhanced passive follow-up' until a test on day seven which, if that is also negative, means they move to 'passive follow-up'.

More information can be found at www.covid19.gov.gg

Kazakhstan and the United States Virgin Islands have moved from category two to three, meaning arrivals can be tested on day one and day seven with self-isolation until the day seven test is negative. From there they will be subject to 'enhanced passive follow-up' until after their 14th day in Guernsey.

Iran has moved into the highest category.