EU referendum campaign: Big businesses warn of the dangers of leaving the European Union

EU referendum campaign: Big businesses warn of the dangers of leaving the European Union; ENGLAND: Berkshire: Slough: O2 Headquarters: INT David Cameron MP (Prime Minister) rising to speak to staff at the start of the EU referendum campaign and taking off his jacket O2 staff looking down from balcony O2 staff looking on from staircase Cameron speaking Staff listening TILT DOWN Cameron speaking David Cameron MP (Prime Minister) speakign SOT - I'm going to speak, for the next 4 months, of the advantages of staying in (the EU) and the dangers of coming out CUTAWAY O2 workers listening Slough: EXT Woman pushing pushchair along road past sign reading "Slough means business" Aircraft seen flying behind building View over buildings and factories SCOTLAND: Edinburgh: INT Jayne-Anne Gadhia (Chief Executive, Virgin Money) working at conference table Gadhia Jayne-Anne Gadhia (Chief Executive, Virgin Money) interview SOT ENGLAND: London: Plaistow: Large roll of bags for Tate and Lyle sugar rotating on production line Bags of sugar along on conveyor belt Bags of sugar passing through processing plant EXT Cargo ship being unloaded Gerald Mason (Senior Vice-President, Tate & Lyle) interview SOT