► Watch 'Three big Brexit unknowns, in 90 seconds' and more: http://on.ft.com/2n4ptfs<br /><br />The FT's chief foreign affairs commentator Gideon Rachman explains three unknowns in the UK’s divorce process from the EU: the challenge in negotiations, events in the wider world and the unpredictable economics of new trade deals<br /><br />► Subscribe to FT.com here: http://on.ft.com/2eZZoLI<br /><br />► Subscribe to the Financial Times on YouTube: http://bit.ly/FTimeSubs<br /><br />For more video content from the Financial Times, visit http://www.FT.com/video<br /><br /><br />Twitter https://twitter.com/ftvideo<br />Facebook https://www.facebook.com/financialtimes
