It may well be.I think the fact "additional tax rate" kicks in at £150,000 is a good sign that even the generally wealthy agree with your estimate of what passes for "wealthy" or "rich" in this country.
Is 'additional tax rate' code for 'move your registered office to Luxembourg'?
Additional Tax Rate is the top Income Tax rate. So once you take the personal allowance in to account, and the point various rates kick in at, I guess take home rate would be around £85,000 or so. But you knew that.