On the anniversary of the Treaty of Paris a surprise announcement from PM Theresa May;
http://www.bbc.co.uk/news/uk-politics-39629603
The decision does seem difficult to reconcile with earlier calls from the PM for focus to be on negotiations and constitutional calm a requisite for focus.
The post-Brexit dynamics might make for quite unprecedented shifts in parliamentary seats particularly amongst the parties situated on the 'Remain' side of the debate over the EU Referendum.