I'm just saying, but
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Everyone wants to trade with the UK still. And of course there is no way that they'll suddenly tax their financial sector into oblivion.
What we're seeing here is indeed that things are just getting started. Politically and speculatively, there's a lot of shit going around. Generally pro-EU politicians will not want to invoke article 50 out of their personal beliefs, and the market speculation wants to drive British everything down as far as they can so they can buy cheap for the recovery, whenever the politicians get around to actually showing the trade deals made.
Side note, I do believe the term for what happened with the Pound was a 'bear trap', where something drops rapidly and then shows signs of slow recovery, making some people buy in again.
And then it drops further, which should make these people sell at a loss to prevent losing more. That's more money for the big companies
In short, markets are complex and if they find a way to stir panic to get the prices down, they profit off it. So when you hear financial companies saying they're moving out of London to Germany, that's one of two things;
Political
Or them going in harder on making the Pound and British stock drop harder to profit off it.
They don't care at all about the regular British citizens who had 10% of their savings wiped out, they care about the profit they just made short selling Pounds