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Stephen Sackur speaks to Graham Turnock, Chief Executive of the UK space agency. Britain's exit from the European Union has generated intense scrutiny of borders, tariffs and trade. But the shock waves will spread much further. A complex web of scientific collaboration and partnership is in jeopardy - most obviously in the field of space and satellite technology. The UK stands to be frozen out of the Galileo project which will deliver a European rival to the American GPS system. Will post Brexit Britain be left behind in the race to reach new scientific frontiers?