Labour leader Ed Miliband refused to be drawn on whether his party would borrow more money in order to pay for policies to alleviate the "cost of living crisis".
He told BBC1's Andrew Marr Show that Labour would not borrow more for "day to day spending" but did not expand on the issue.
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The violence began after a counter-protester allegedly doused a female rally organiser with pepper spray.
As temperatures climb through the day, the warmest spots are likely to be across western parts of Northern Ireland and western Scotland.
The foreign secretary has criticised internet and social media giants for failing to detect and remove extremist material posted online.