the average UK salary is £32k. in London your average midlevel engineer salary band is 60-75k. Senior band is 75-110 - this includes principles and directors as well. For total comp add 10% of bonus. given anemic uk tech sector most stock is yeah worthless so let's not count it - unless you work for Wise, Revolut etc.

the people making big bucks i.e £200k+ in tech - are in finance / hft / trading firms. then in government consulting.