During the 1837 General Election, voters in Hawick attacked Tory supporters and threw 11 of them in the river. The pro-Liberal crowd then besieged Tory supporters in a tower and bombarded them with stones. The Liberal candidate then won the seat by only 44 votes.
Violence at UK elections was common throughout the 18th and 19th centuries.
In the 20th Century:
Clement Attlee, speaking at St Andrews University in April 1947, was showered by pepper released from a box which had been installed directly above the platform by a group of students……The catalogue of British political assassinations stretches back to the fatal shooting of Spencer Perceval in 1812, and includes other figures like Tory MPs, Ian Gow, Sir Anthony Berry and Airey Neave, all victims of Irish Republicanism.https://www.spectator.co.uk/article/a-short-history-of-political-violence
Yesterday, Michael Settle of the Herald wrote: Next general election could be the nastiest in Scotland’s history. He’s not that young. Shouldn’t he have known or even guessed that the headline was unlikely to be correct?