The U K Financial Services Trade Pre-Brexet

i spoke to sarah hall of the university of nottingham. Sheis the author of the chapter on post brexet financial services arrangements. We had a significant trade surplus in financial services with the e u. This was based on single market membership for the u k. And specifically something called passporting. But that's gone now, so what has replaced it? Has anything replaced it? And how much access to e u? Markets do u k financial services firms have?