They say that instability worries the stock markets, so an outfit like the tax-avoiding Barclay Brothers, owners of the Torygraph and based in Monaco and Brecqhou in the Channel Islands can wreak havoc with their Правда-like stories.

I suppose it is a way to make money from Brexit news. I expect there are others with similar ideas.

Here's how. Create disruption. Sell short. Sell shares you don't own and buy them back on the instability pushing the prices south. Make sure it's all done through offshore arrangements and then there's no tax bills to worry about.

Here's the last few days on the market, with today's news creating a further wipeout.