Boris Johnson's decision to defy David Cameron and back a Brexit caused the pound to fall off a cliff this morning. The pound slid towards its lowest level against the dollar since the election in May 2010 and also fell against the euro, the yen and 14 other world currencies. Experts believe that Boris Johnson's decision to back Britain leaving the EU has caused market uncertainty but investors are also spooked by the Prime Minister’s renegotiation deal with Brussels. Traders began selling off the pound this morning sending the price down 1.7 per cent - the biggest one-day drop sparked when the 2010 election produced ... (full story)