Earlier quoted context omitted.
I own a house in London. Its total value increase since I bought it 5 years ago is much less than my salary.
Then I guess your salary is amazing, because many house prices across London have doubled in 5 years. If you somehow bought a house at a reasonable earnings multiple, say 4x earnings, then your house has appreciated essentially what you earned over the last 5 years. This is just math.
https://www.bloomberg.com/graphics/property-prices/london/ shows the median as having gone up around 6% in total since 2017. Trying a mix of neighbourhoods in that tool, I can't see any which are close to 100% up.