Multiple finance firms are on record as doubling down on London, including all of the largest names.
Your sources are all conjecture.
>“I would expect that 3,000 to 4,000 more investment bankers, especially industry-focused specialists and debt and equity issuance advisers, will have to leave London and come back to Europe,” said Andreas Halin, founder of Global Mind Executive Search Consultants GmbH
Oh, so it's analyst conjecture and not an actual source. Goldman Sachs themselves have committed to the city -- with a billion dollars in office space alone.
>London Finance Job Openings Fell 49% in 2020 on Brexit, Covid
Huge leap to blame this on Brexit given the virus conditions. In actual reality, looking at real headcount numbers from the Financial Times, almost nothing has happened (some firms have expanded). [1]
[1] https://www.ft.com/__origami/service/image/v2/images/raw/htt...