The former Labour PM said the UK, once admired for its tolerance and pragmatism, now presented 'an ugly picture'
Mr Johnson has already pledged that the UK will leave the EU by the 31 October deadline, with or without a divorce deal.
He added:"Johnson's flying visits to all corners of the UK have done nothing to dispel the impression that under him the world's most successful multinational state is devoid of a unifying purpose powerful enough to hold it together and to keep four nationalisms - Scottish, Irish, English and also a rising Welsh nationalism - at bay."
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