What are the rules on self-isolation of drivers in their cabs?
Coronavirus (COVID-19): safer practice for international hauliers – GOV.UK (www.gov.uk)
The driver and crew must isolate in the cab of their vehicle while they are working in England.
You can leave the cab for essential purposes, including to:
take a COVID-19 test
seek medical and emergency assistance
use wash facilities including using communal showers
carry out work, such as deliveries, loading and unloading
ensure your vehicle and load are roadworthy
finalise customs documentation at a Customs / HMRC inland border facility
You should also leave your vehicle if directed to do so by enforcement officials.
If you are covered under the green list rules or fully vaccinated amber list rules, you do not need to isolate in-cab or quarantine on arrival, although you are encouraged to stay in your cab whilst working to limit your exposure to COVID-19.