They’ve got previous form from the Opium Trade.
If the EU is the Hanseatic of old, then it is only old comfort for them to go to London. The Hansa wants City of London, not all the other stuff. After all, it is only through European towns and trade that the City of London grew large enough to take on China in China. The EU hopes to hold on to the City of London, the opium of the crown, before the Chinese, but the cards were dealt a long time ago.