The party's activities were generally limited to meetings, the publication of a journal, The People's Post and the contesting of a single by-election in Hythe, Kent in 1939. The campaign for the 1939 Hythe by-election, in which former Labour Party member St. John Philby was the BPP candidate, was fought on an anti-war platform. Despite gaining the public support of the likes of Sir Barry Domvile, leader of The Link, the campaign was not a success and Philby was unable to retain his deposit. Philby claimed that he agreed with none of the BPP's views apart from their opposition to war. He was more disposed towards the Labour Party but felt they were becoming too pro-war. In Philby's mind, as well as popularly, the BPP were seen as more of a single issue anti-war party.
During the war
After the outbreak of the Second World War the BPP was involved in British Union of Fascists-led initiatives to forge closer links between the disparate groups on the far right, although in private Oswald Mosley had a low opinion of the BPP, dismissing Beckett as a "crook", Tavistock as "woolly headed" and Greene as "not very intelligent". Beckett's internment under Defence Regulation 18B in 1940 saw the party go into hibernation, although it was not subject to any government ban. The patronage of Lord Tavistock, who succeeded to the dukedom of Bedford in 1940, ensured that the BPP was exempted from proscription. The group was briefly involved in a clandestine alliance with A.K. Chesterton's National Front After Victory in 1944, a group that also attracted the interest of J.F.C. Fuller, Henry Williamson, Jeffrey Hamm, William Morris, 1st Viscount Nuffield and Lymington amongst others. However, the movement was scuppered when it was infiltrated by the Board of Deputies of British Jews, who fed information to Robert Vansittart, 1st Baron Vansittart, whose speech about the dangers of a revival of fascism led to a crackdown on such movements.
Final years
The BPP name was heard again in 1945 when the party organised an unsuccessful petition for clemency for Beckett's former ally William Joyce, who was executed for treason. Before long the BPP returned to wider activity after the war when party policy focused on monetary reform and the promotion of agriculture. With the Union Movement not appearing until 1948 the BPP initially attracted some new members, including Colin Jordan, who was invited to join in 1946 and was associated with the group for a time before concentrating his efforts on the more hardline Arnold Leese. The party contested the Combined English Universities by-election on 18 March 1946 but received only 239 votes. The BPP officially disbanded in 1954.