[pja]

No, because I'm including National Insurance (both employers and employees) under income taxes. Employers NI is 14% of headline salary, so the effective tax rate for high earners is more like 50% than 40%. Meanwhile middle income people pay 12% NI on top of their income tax and 14% employers national insurance so the real rate of tax on the cost to their employer is about 40%.

Go do the sums & you'll see. Like I said, the reality is much more complicated, but the figures I gave are roughly in the right ballpark.