 He subsequently formed the United National Party (UNP) in 1946, when a new constitution was agreed on, based on the behind-the-curtain lobbying of the Soulbury Commission.At the elections of 1947, the UNP won a minority of the seats in Parliament, but cobbled together a coalition with the Sinhala Maha Sabha of Solomon Bandaranaike and the Tamil Congress of G.G.Ponnambalam.