Brexit was caused by a lack of legitimacy - immigration was simply one element that elevated (fueled?) that public perception of illegitimacy.
Once brexit was voted on the salience of immigration as 'a problem' in the popular public consciousness diminished very significantly. It ceased to be a first order issue, and Pew Global polls on social attitudes continue to show the UK as one of the most tolerant countries in europe (and significantly more tolerant than most EU neighbours!).
During this time our 'anti-immigrant' government has basically given a free-pass to hundreds of thousands British National (Overseas) status holders arriving from Hong Kong, so I wouldn't put too much weight in that argument:
https://www.gov.uk/guidance/hong-kon...al-authorities
Even the current hullabalo over illegal immigration via the channel from France is seen as an extension of the power struggle over Brexit.
Labour's problem is also one of illegitimacy - in that the values the public see do not appear to have strong appeal to the sections of the electorate that would in previous times have been considered its core voter base:
https://twitter.com/paulmasonnews/st...66280811778053
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