There was far more to this than Brexit; there were many domestic issues upon which the tories would have used a strong mandate to impose their will. Reducing help for the disabled; placing the burden of old-age care on the individual instead of considering equitable funding solutions; bullying of the self-employed (NI contributions, quarterly tax assessments and exclusion from Universal Credits). The British people suddenly became aware of what might be done to them at home. I don't think Brexit was then such a big issue.
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