Earlier quoted context omitted.
What part of > £55k as being equivalent to $100k in the US Is not? I don't see any argument for that not being correct. Everything you said about costs, sounds that exact same as $100k in the US. Unless you live in North Dakota, chances are you are paying pretty close to the same percentages for rent/foot in a larger city such as San Fran or Chicago. Not exactly sure what zone 5 is, but a rough search gave me $2500 f…
UK payroll taxes are also probably a larger percentage.
Insurance is also less, both contents and car insurance. Utilities a lot lower (fast internet for £30 a month, sim only contract with 50GB of 5G data for £15 a month).
There is this strange idea that the UK is super expensive, and whilst not cheap, a lot of things are decidedly cheaper in the UK than they are in the US.
Also student loans - universities are capped at £9250 per year, so you've not got hundreds of thousands in student loan debt to pay off either.