The main UK income tax rates and brackets for 2018/19 are:
Taxable Income Tax Rate (Band) Tax Rate
Up to £11,850 Personal allowance 0%
£11,851 to £46,350 Basic rate 20%
£46,351 to £150,000 Higher rate 40%
Over £150,000 Additional rate 45%
These rates only apply if you live in England, Wales or Northern Ireland. The devolved Scottish government sets its own income tax rates,
Interesting. Certainly down from the 80s. But Thatcher WAS busy dismantling as much of British Socialism as she could at the time.