"The total tax take has fallen for 40 years and we now see the result. Funnily enough the biggest fall has been from the wealthy and corporations. Who’d have thought it?"
Any references for that claim?
Checking the results over the last 40 years (or since 1963 for that matter as the Guardian has published the data here: https://www.theguardian.com/news/datablog/2010/apr/25/tax-receipts-1963) and adjusting for inflation (from here https://www.officialdata.org/1860-GBP-in-2017?amount=1), I get:
Total tax increase: 247% over last 40 years
Total tax increase adjusted for inflation: 69% over last 40 years