Does not appear to be the case in London. I know indirectly people working in Google around here and they are on the low side of banking salaries.<p>Getting $250K is certainly doable in bank, but it does not follow a specific career plan. I have known senior system tester making 150K GBP and for the same job and responsibilities another was making 50K GBP. 
Doing it in 5 years out of school is difficult in tech.<p>It is doable without too much trouble in finance in trading, m&amp;a, ... the trick is that you need to survive which require more luck than skills.<p>Overall though, in the 4.5 million workers in London, only 120K make between 100K GBP and 200K GBP, and 60K that make more than that.