ward and the northern part of Derriaghy ward to this seat. Following public consultation, the proposals were passed through Parliament via the Northern Ireland Parliamentary Constituencies Order. In an unprecedented move by a Boundary Commission, an electoral ward was split between constituencies following disquiet in parts of Derriaghy. This ward is now split between Belfast West and Lagan Valley. History Belfast West has historically been the most nationalist of Belfast's four constituencies, though it is only in the last few decades that the votes for unionist parties have plunged to tiny levels. The constituency is largely made of a long, slender, belt along the Falls Road and its suburban extensions, with three of the five wards from the staunchly unionist Shankill area now something of a bolt-on, with a several kilometre long peace line dividing them from the rest of the constituency. There is also a smaller Protestant enclave at Suffolk. The tenor of the constituency is largely working class and in the 1991 census it was one of only twenty constituencies where the majority of housing was still state owned. Although there are now large pockets of middle-class housing in Andersonstown and other suburban parts of the seat. Closer to the centre public-sector terraced housing, both Victorian and high quality modern housing, predominates, while in the suburbs, leafy pockets are scattered among post-War housing estates such as Lenadoon and Twinbrook. The Westminster constituency was consistently held by the Ulster Unionist Party but always had strong Labour movement sympathies. In the 1923 UK general election, the Belfast Labour Party came within 1,000 votes of taking the seat. A by-election in 1943 was won by Jack Beattie, standing for the Northern Ireland Labour Party. For the next twenty-three years the seat would regularly change from unionist to nationalist/labour, with the latter represented by a variety of parties. In the 1966 general election the seat was won by Gerry Fitt of the Republican Labour Party. Later in 1970 he left that party to become a founder and first leader of the Social Democratic and Labour Party. In the February 1974 general election, Belfast West was the only constituency in Northern Ireland to elect an MP supporting the Sunningdale Agreement. Fitt's majority was a narrow 2180 votes in February 1974 primarily due to the candidature of Albert Price, father of the Price sisters who were in prison in England for PIRA related offences.