Except that NZ which is very much modeled on the UK switched to MMP and it works much better.

https://elections.nz/democracy-in-nz/what-is-new-zealands-system-of-government/what-is-mmp/

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Thank you, I will read and consider. However I still believe it's very difficult to compare two different systems over the long term. Also the conditions prior to NZ's change will not necessarily be the same in the UK.