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LONDON, ENGLAND - JANUARY 24:  A man carries a European Union flag outside the Supreme Court in Parliament Square ahead of the ruling on whether Parliament have the power to begin the Brexit process, on January 24, 2017 in London, England. The judgement will play an important role in how the Government proceeds with it's planned use of the EU's Article 50 exit clause.  (Photo by Leon Neal/Getty Images)
LONDON, ENGLAND - JANUARY 24:  A man carries a European Union flag outside the Supreme Court in Parliament Square ahead of the ruling on whether Parliament have the power to begin the Brexit process, on January 24, 2017 in London, England. The judgement will play an important role in how the Government proceeds with it's planned use of the EU's Article 50 exit clause.  (Photo by Leon Neal/Getty Images)

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Brexit implementation period 'will take years'

"No serious negotiations happen until after the German elections," Gus O'Donnell, who led the UK's civil service for six years, tells Christiane Amanpour.

Brexit implementation period 'will take years'

"No serious negotiations happen until after the German elections," Gus O'Donnell, who led the UK's civil service for six years, tells Christiane Amanpour.