As the British government informs on his official webpage there are some jobs that qualify for travel exemptions.
The following persons are exempt from compulsory self-isolation:
❎People coming to England for the purpose of transit to another country
❎Seasonal workers working in the agricultural sector who are provided with work on a specific farm
❎ Registered health care workers if coming to England to perform work duties not necessarily related to the coronavirus
❎ Professional drivers transporting goods or passengers in international road transport
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