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Right, let us get down to basics:
When you left in 18/19 did you send a Form P85 to your UK tax office?
When you came back in 19/20 did you tell HMRC of your arrival by letter?
When you left in November 1920 did you send a Form P85 to your tax office?
Then the original P85 will probably stand and you will still be classed as non resident.
I do not think you need worry overmuch, the COVID crisis is exceptional. There has not been a pandemic like it since the flu one in 1918. Having said that, in 1918 300 million died.
I have a nasty feeling that a number of countries will be ruined before we come out of the wood.
Great minds think alike!