By , LONDON/BRUSSELS (Reuters) - Britain and the European Union are seeking a post-Brexit trade deal, with failure likely to result in increased chaos in mutual trade, financial markets tumbling and huge economic costs.Here are some of the potential pressure points of a failure to reach agreement on trade.Investors and banks have long predicted a trade deal would be done, so a no-deal would hit the British pound, foreign exchange traders say.But investor sentiment was hit by the sides saying on Saturday that there was still no agreement covering annual trade worth nearly $1 trillion, and...…By , LONDON/BRUSSELS (Reuters) - Britain and the European Union are seeking a post-Brexit trade deal, with failure likely to result in increased chaos in mutual trade, financial markets tumbling and huge economic costs.Here are some of the potential pressure points of a failure to reach agreement on trade.Investors and banks have long predicted a trade deal would be done, so a no-deal would hit the British pound, foreign exchange traders say.But investor sentiment was hit by the sides saying on Saturday that there was still no agreement covering annual trade worth nearly $1 trillion, and...WW…