Institute a new national holiday for England. This should be a bank holiday, and would be on 15th June, the day in 1215 when Magna Carta was signed, which was a giant step towards English democracy.
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My suggestion is to have a public holiday on 15th June for Magna Carta Day. It's not a patron saint's day, so it's not religious, it's properly English, is important to our democracy, and has influenced other countries in one way or another, and it's in the summer!