The one I worked for wanted me to move to London, and I said fine, as long as you give me a comparable standard of living.
Nope, they took my Irish salary and converted it to GBP, and that was it (this was post Brexit, btw).
Obviously, I didn't move. And working with any engineers in the London office was a massive pain as anyone without family commitments worked in London for a year, and then transferred to the US for a massive salary bump.
The core issue is that FAANG don't benchmark against finance in London, which means that pay is pretty out of wack.
For instance, I got a 150K offer from an investment bank in London around that time, and I'm definitely not as useful in finance as I would be in tech.
It just blows my mind that they haven't fixed this to be honest (I suspect that they'll have to, now that Brexit has actually happened).
But even putting that aside, most senior (E5) Facebook engineers in the UK make 125-160k base salary in the UK. Even if that's denominated in USD, that still leaves a significant % breaking 100k GBP base.
Source: https://www.levels.fyi/company/Facebook/salaries/Software-En... (filter for "United Kingdom")
I have two guesses - either you were a contractor, or worked for a bank where I've heard it's possible to cross £100k salary. Or third option, you mean <£100k of salary + bonuses?