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My question is are people actually that rich or they just to like to show off ?
You can't always judge something by how it looks on the outside. Even though downtown London seems so fancy and rich, that tiny part doesn't show everything going on across the whole city or all the money struggles folks in the UK face and we gotta remember too that being happy isn't just having a bunch of stuff, and people can get money from all kinds of places, not regular nine-to-five jobs. Those big paychecks people get in London usually gotta cover some pretty big costs of living too.
Average salary comparisonThe average salary in London is £60.5k. The UK average salary was £42.2k in 2023. Gross average salary is calculated for full-time employees. Employee has to be in the same job for over 12 months. The data collected is Tax Year Ending. The income includes incentive payments and are available for local government districts/counties.

https://www.plumplot.co.uk/London-salary-and-unemployment.html