https://www.numbeo.com/cost-of-living/compare_cities.jsp?cou...
Internet and TV ~1.5x as expensive. Mobile phone plan ~2x as expensive. Simple things like fresh fruit and veg at least 1.5x. Utilities ~2x as expensive.
Although, that said, we can keep going down the line and look at cities like Raleigh or Austin where wages are not that much lower than here and prices are way lower. Definitely have been tempted by that at times.
The data seems to be suggest that Boston is reasonably comparable to London[1]. This isn't my experience though.
[1]https://www.numbeo.com/cost-of-living/compare_cities.jsp?cou...
In my experience however this does not translate to actually being twice as wealthy :(
And in the NHS, healthcare costs are paid via taxes, which means less take home money. So in fact, you'd expect UK wages to be higher to make up for it.
The median full-time job in the US pays around $45,000. That median person has no four year degree and is not living in a coastal city.