I can't really speak for the tax, but QoL is pretty good in London. Compared to the other cities I've lived in (>9mo in Glasgow, Portsmouth, Manchester, Sheffield, Southampton, Austin, Berlin, and Hamburg), the city has everything. It's more expensive than all those other cities, except maybe Berlin, but compared to similarly sized places it's not bad. Factoring size and location, the equivalent of my 1 bed flat in Clapham would be about 120% more in NYC.
London has one of the highest percentages of green space of any large city (33%), excellent public transport, some of the best music and theatre in the world, options in all British sports supplemented by regular visits from American leagues, excellent (though not leading) restaurants and speciality food markets, and more. You can't discount the English language either.
Regarding Brexit, at the moment it's kind of hard to say because COVID (and the ongoing collapse of the government) has muddled its economic impact so much.
London has one of the highest percentages of green space of any large city (33%), excellent public transport, some of the best music and theatre in the world, options in all British sports supplemented by regular visits from American leagues, excellent (though not leading) restaurants and speciality food markets, and more. You can't discount the English language either.
Regarding Brexit, at the moment it's kind of hard to say because COVID (and the ongoing collapse of the government) has muddled its economic impact so much.