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One of Whitehall's most senior officials has warned of potentially "horrendous consequences" of a no-deal Brexit -- if co-operation with the EU breaks down completely.

The chief executive of the Civil Service, John Manzoni, told MPs that Britain would be ready -- but not everything would be perfect.

He was giving evidence to the Public Administration Committee alongside Sir Mark Sedwill, the acting Cabinet Secretary.

Robin Edwards reports.

You can hear more from Today in Parliamen at 11.30pm on Radio 4.