This is one of the situations that no one would have wanted to be in. The Corona Virus has a major impact in the economy and health worldwide.
More worst is the situation of the expats or foreigners who have visited UK and are now in UK on the visa that is expiring and unable to leave because of the travel restrictions.
UK Home Office and Government had a guidance initially published in February 2020 for the Chinese citizens who were stuck in UK.
This guidance was updated recently to cover citizens of other countries too.
If you’re in the UK and your leave expires between 24 January 2020 and 31 May 2020
Your visa will be extended to 31 May 2020 if you cannot leave the UK because of travel restrictions or self-isolation related to coronavirus (COVID-19).
You must contact the Coronavirus Immigration Team (CIT) to update your records if your visa is expiring.
The guidance continues with the following
You should provide:
your full name (include any middle names)
date of birth (dd/mm/yyyy)
your previous visa reference number
why you can’t go back to your home country, for example if the border has closed
Regarding the Switching of Visa, the guidance also states the following
If you’re applying to stay in the UK long-term
During these unique circumstances you’ll be able to apply from the UK to switch to a long-term UK visa until 31 May. This includes applications where you would usually need to apply for a visa from your home country.
You’ll need to meet the same visa requirements and pay the UK application fee.
This includes those whose leave has already been automatically extended to 31 March 2020.
You can download the Coronavirus (COVID-19) factsheet: visa holders and Short-term residents in the UK which is published by the Home Office to understand more about these concessions.