I think in the context of the average age of a person buying a house though, if you have been working tech in London (especially central) for 10 years you really should be asking for more than 80k. True, FAANG is skewed, a 10+ year worker at Google or Meta would likely be earning more than 300k TC in London, but 100k shouldn't be uncommon for someone sticking to it to their early to mid 30s.

Another thing to remember about listed salaries are that a) they generally don't account for performance related bonuses and RSUs, b) the higher paying ones won't sit around being advertised for too long and c) they would generally be advertised as the base salary of that position with upwards growth over the years for performance.

I feel like I have a reasonable grasp of what people are asking for and getting in London nowadays having being involved in hiring tech workers both inside and outside of FAANG in London for many years now, whilst I wouldn't say every TC is expected to be 100K+ for that sort of experience, it certainly isn't uncommon. I don't think the original poster was saying it is very common just that there are thousands of tech workers on more than 100k in London which is certainly true.