Agreed, it is a reasonable amount, but how many London companies outside of finance/trading have you seen advertise 80k-100k? The most common numbers I see is 45-65k.
But I had a profile on Hired.com open for ~ a week, and all the companies who I normally see advertising 60-80 offered me 100.
That's about 10 datapoints saying that for the right CV they'll go there.
To be honest, I get the feeling finance goes much higher than that for the right person.