And what salary would you get for Google in London?

FYI as an experienced professional I have just been pitched a couple of civil service jobs in London grade 8 to Grade 7 at around 75k - and that would give me about 6.5 k

That's the eqvielent of a full Colonel / GS15 if its the higher grade.

And I bet a FANG in London pays way more than that as do train drivers