I think it's from Reuters18 Oct 2019 10:32
...London's share of global daily forex turnover has rocketed to a record 43% - from 37% in 2016 - as it stole market share from New York and Asian hubs, according to a Bank of International Settlements survey last month.
London has long led in forex thanks to its convenient time zone and cutting-edge trading infrastructure.
But the news surprised many who had predicted Brexit would drive an exodus of banks and traders from London, or at least arrest its growth, while cities such as Hong Kong and Singapore were seen benefiting from a boom in local currency activity.
"London is hard to beat ... The depth and diversity of the skill pool here is unrivalled," Matthew Hodgson, the founder of Mosaic, one of a clutch of new fintech companies tapping into the forex industry.