Productivity isn’t just a measure of how much workers produce. It’s also a measure of how much is invested.
Productivity is low because our government does not invest in infrastructure- by that I mean public transport, healthcare, schools, roads etc.
The countries that do, will encourage business investment because business owners know that staff, customers and suppliers can get around, that staff and customers are healthy etc.
Government spending money is a good thing - eg if they build and maintain schools/hospitals, not only does it benefit the population but it also provides jobs eg for construction companies.
Government paying workers decent wages is a good thing because it will boost the economy as people have money in their pocket and can spend it on discretionary things.
The conservatives are ultimately narrow minded because they fail time and time again to invest as a government and businesses will always find them out. They have this bizarre idea that only the rich are worth supporting.
Its utter fallacy and is why we are yet again the sick man of Europe. Back again where we were in the late 80s/early 1990s. And New Labour, just carried on elements of this thinking and missed the opportunity to actually make us a stronger country.