There's a lot of variance and of course these kinds of surveys are also always contingent on industry and years of experience but taking currency exchange rates into account (which of course is questionable, too because in many aspects of daily life 1 USD probably equals 1 EUR) the factor is more like 1.3 to 1.5 at the most:
https://money.usnews.com/careers/best-jobs/software-develope... http://www.payscale.com/research/US/Job=Software_Developer/S... https://www.computerwoche.de/a/der-grosse-gehaltsvergleich-f...
> The finance industry in London is one of the few markets outside US that are comparable with US in salary, particularly contractors - £800/day is not uncommon for finance devs.
From my experience (which comes from client leads) the maximum is more like £550 / day with the average at about £400 and even £300 per day not being unheard of and that's pre-Brexit-vote. Since then daily rates have decreased.