Take the Fixed Term Parliaments Act.
It was clearly a signficant constitutional change, but introduced by a simple series of majority votes in Parliament.
1/
BUT it only needs a simple majority to overturn the Act, by passing another Act to temporarily suspend it.
But it wasn't, so it doesn't.
If they did they could easily overturn the 2/3rds requirement thru this simple majoriy route. They could force an election even if nearly 50% of MPs did not want one.
Again, it would be normal to require a super-majority and/or a minimum turnout in most democracies for such a change.
Not in the in the UK.
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