This is so misleading.
At £90K you get a £12,579 tax free allowance leaving £77,421 taxable. You will pay £7,540 from the 20% band, £15,888.40 from the 40% band and nothing from the 45% band for a total of £23,428.40. National Insurance will be £5,318.60 making the total deduction £28,747.
So approx 32%.
Edit: which yes takes it to 43% not the 45% I originally wrote.
Now enjoy paying another 20% VAT on any goods and services
Only the part of that that would actually be passed through to you as salary in the absence of the tax could reasonably be considered part of your tax burden. Hard to say how much that is without any information about your field or employer, but I guarantee it's less than 100%.