The Doughnut is tested in nations with Proportional Voting. The UK wouldn't do it because their form of democracy is like ours, too closed minded.

I wrote an article 'Doughnut Politics - we are destined to live in real democracies'

https://fred-rick.medium.com/doughnut-politics-8c6257c91b1e

Meaning: in the UK and the US we do not live in real democracies because we have winner-take-all. Most decisions in UK and US are minority decisions because we vote in districts, so we have majority rule applied twice.

* First we vote who is going to get the seat, say with 60%.

* Next, our 'representatives' make a decision, say with 60%.

Result: .6 x .6 = 36 percent. What appears to be majority rule is most often minority domination because we were divided into districts first, and therefore conquered in one round.

In the Netherlands and Belgium, majority rule is applied just once. So a 60% decision by Board or Council in the Netherlands or Belgium has the support of 57% - 60% of the voters.

That is why their form of capitalism is a little better than ours in the UK and US. We were divided and conquered in one round of district voting.