The General Election battle lines have been drawn but can marketing make a difference in just 7 weeks?

Prime minister Theresa May today (18 March) called a surprise general election on June 8. With time not on their side, have the Conservatives, Labour and Liberal Democrats learned their lessons from elections gone by to execute a seamless campaign in just seven weeks?
A general election held less than two-months after it was called is, commentators have speculated, one of the shortest notice periods in living memory. The Fixed-term Parliaments Act 2011 sets the interval between general elections