Of all the problems Britain has created for itself with Brexit, the Irish border is probably the most difficult for Theresa May's Government. If Britain makes a clean break with the European Union, as desired by the likes of Boris Johnson who resigned as her Foreign Secretary yesterday, customs posts
Editorial: Brexit mess gets worse as time runs out
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With just nine months to go on Britain's notice that it is leaving, and just a few months left to have terms agreed in time for a vote of all members, no deal seems possible. Unless there is a change of Government.
If May resigns and the Conservatives remain too divided on this issue to unite behind a new leader, another general election will be needed. Almost certainly it would result in a Labour Government more capable of coming to terms with the EU.
Labour's leader Jeremy Corbyn might be a lukewarm European but the party's MPs were solid "remainers" at the referendum. If the balance of public opinion has been changed by the difficulties Brexit is posing for British business, a Labour Government might yet be able to negotiate a new economic relationship.
Theresa May's party clearly remains too deeply divided to do any sort of deal and its days look numbered.