This is nearly always not actually a reason not to vote as because in almost every constituency the number of people who do not vote outnumbers the vote of the winning party this means if everyone who does not vote did as you will do and all get out and vote the vote could go any way, even a fringe party could be elected if the non-voters vote together. To illustrate lets take a look at Kirkcaldy and Cowdenbeath, one of the safest seats in the UK, former British Prime Minister Gordon Brown’s seat. In 2010 Labour won with 65.2% of the vote, [1] with 29559 labour votes compared to 6550 SNP a majority of 23009. [2] However in this seat turnout was only 62.2% that means that 27863 people did not vote, considerably more than voted for Labour. If they voted together for someone else those who do not vote could always throw out the party in power. No seat is therefore really a safe seat, they are safe because who believe their vote is not worthwhile do not bother to vote when in reality if they did they could make a difference. Indeed in the Scottish elections of 2011 the SNP managed to take a large part of this same seat. [3]  [1] Electoral Calculus, Majority Sorted Seats  [2] Wells, Anthony, Kirkcaldy and Cowdenbeath, UKPollingReport, 2010  [3] ‘Vote 2011 Scotland elections, Kirkcaldy’, BBC News, 11 May 2011