The Conservative candidate was Tim Smith, aged 34, who had been the surprise winner of the 1977 Ashfield by-election, where he overturned a Labour Party majority of nearly 23,000 votes. However, he lost the Ashfield seat at the 1979 general election, and was seeking to return to Parliament. The SDP-Liberal Alliance chose 40-year-old Paul Tyler, who had been Liberal Party MP for Bodmin from February 1974 to October 1974. The Labour Party selected as its candidate an unknown and untested 29-year-old barrister called Tony Blair, an aspiring politician who had been advised by Labour MP Tom Pendry to seek the party's nomination to gain political experience. Three other candidates stood, including Tom Keen, from the Campaign for a More Prosperous Britain, who held the record for the most candidacies in a single general election, and 78-year-old by-election veteran Bill Boaks, an eccentric campaigner for road safety, who usually described himself as "Air, Road, Public Safety, White Resident" or "Democratic Monarchist, Public Safety, White Resident". On this occasion, he chose the latter label.
Result
Beaconsfield is one of the safest seats held by the Conservative Party, and a Conservative victory was expected. The real fight was for second place; the Liberal candidate had finished a close third in 1979. Labour fought to remain the main opposition party for the seat. In the March 1982 Glasgow Hillhead by-election, SDP's Roy Jenkins won a traditionally Conservative seat for the Alliance, with Labour, previously the main challengers in Hillhead, in third place. With SDP winning three of four by-elections since its formation in March 1981, The Glasgow Herald speculated that the new party threatened the Conservatives' hold on Beaconsfield. However, in the intervening weeks the Falklands War began. The 53% turnout was almost 20 percentage points below 1979's, and unusually low for a by-election. Smith held the seat for the Conservatives, with a share of the vote comparable to the general election. The Glasgow Heralds William Russell stated that the outcome "firmly endorsed" the First Thatcher Ministry's conduct of the war. Party chairmanCecil Parkinson claimed that the result was better than he had expected. Tyler increased the Alliance's share from 17.1% for Liberals in 1979 to 26.8%. Russell agreed with Liberal Whip Alan Beith's claim that the more than 9% increase was much better than expected, writing that "the Alliance bandwagon may have been temporally stalled" during the war, but the result had some positives for the Alliance.. Labour's vote was nearly halved from 20.2% in 1979 to 10.4%, and Blair lost his deposit. Russell described Blair finishing in third place "a disaster" for Labour. The journalist attributed the poor outcome to "internal squabbling of the past year between Left and Right".