I worked for companies at various sizes FAANG and non-FAANG in London and I would say what FAANG pays is much better than what most of the startups or other companies such as banks pay.

Base salaries are usually similar but RSU and other benefits make the real difference. For example, most of the tech companies in London don't even provide health insurance, since they rely on NHS.

Startups try to use options to convince people but what you're given mostly wouldn't make you a millionaire in the event of exit or IPO.

I guess the other group of companies who could match what FAANG offers as a whole package would be hedge funds. I would say it's harder to enter them tho, since they still can throw your CV to the bin just because you don't have a degree from oxbridge.