AHC: Majority-coop economy in a Western country

With a POD of 1900, can you create a situation where the majority of a country's firms are cooperatively owned? These can be consumer coops and/or worker coops. The remainder of firms can be privately-owned or state-owned in whatever ratio you see fit.

While I'm curious to see what it would take in any Western nation to get to this point by 2019, I'm particularly interested in how to reach this state in the UK by 1970 - but any and all ideas welcome.
 
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