Question: What is the name of the market town in the Metropolitan Borough of Bury that was added to the Rossendale constituency in 1950?

Context articles: Metropolitan Borough of Bury
Rossendale (UK Parliament constituency)
Bury Metropolitan Borough Council election, 2016
Ramsbottom
Bury Metropolitan Borough Council election, 2015
Affetside
Bury
Metropolitan Borough of Wigan
List of people from Bury
Bury Metropolitan Borough Council

The Metropolitan Borough of Bury is a metropolitan borough of Greater Manchester, in North West England.
 Lying to the north of the City of Manchester, the borough is composed of six towns: Bury, Ramsbottom, Tottington, Radcliffe, Whitefield and Prestwich, and has a population of 181,900.
 On the north side Bury bounds the Lancashire districts of Rossendale and Blackburn with Darwen.
Rossendale was a parliamentary constituency in the Lancashire, England.
 Created in 1885, it elected one Member of Parliament (MP) to the House of Commons of the Parliament of the United Kingdom, elected by the first-past-the-post voting system.
 When created it comprised the districts of Rawtenstall, Bacup, and Haslingden; Ramsbottom district was added to the constituency in 1950.
The 2016 Bury Metropolitan Borough Council election took place on 5 May 2016 to elect members of Bury Metropolitan Borough Council in England.
 This was on the same day as other local elections.
Ramsbottom is a market town in the Metropolitan Borough of Bury, Greater Manchester, England.
 The population at the 2011 census was 17,872.
 Historically in Lancashire, it is on the River Irwell in the West Pennine Moors, 3.9 mi north-northwest of Bury, and 12 mi north-northwest of Manchester.
The 2015 Bury Metropolitan Borough Council took place on 7 May 2015 to elect members of the Metropolitan Borough of Bury in England.
 This was on the same day as other local elections.
Affetside is a village in the Metropolitan Borough of Bury, in Greater Manchester, England.
 Historically in Lancashire, it is in the Tottington ward of Bury Metropolitan Borough Council and the Bury North parliamentary constituency, whose current MP is David Nuttall.
 It is located in the West Pennine Moors and shares a border with Bolton in North West England.
Bury ( , locally also ) is a town in Greater Manchester, England, on the River Irwell.
 It lies 5.5 mi east of Bolton, 5.9 mi west-southwest of Rochdale and 7.9 mi north-northwest of Manchester.
 Bury is the largest settlement and administrative centre of the Metropolitan Borough of Bury, with an estimated population in 2015 of 78,723.
 The borough of Bury has a wider population of 187,474 as of 2011.
The Metropolitan Borough of Wigan is a metropolitan borough of Greater Manchester, in North West England.
 It is named after its largest component town and former county borough, Wigan and includes the towns and villages of Leigh, part of Ashton-in-Makerfield, Ince-in-Makerfield, Hindley, Orrell, Standish, Atherton, Tyldesley, Golborne, Lowton, Billinge, Astley, Haigh and Aspull.
 The borough was formed in 1974 and is an amalgamation of several former local government districts and parishes.
 The borough has three civil parishes and lies directly to the west of the City of Salford and southwest of the Metropolitan Borough of Bolton.
 The local authority is Wigan Metropolitan Borough Council.
This is a list of people from the metropolitan borough of Bury in North West England.
 It includes people from the town of Bury and also people from the towns of Radcliffe, Prestwich, Whitefield, Tottington, Ramsbottom and other places which together form the Metropolitan Borough of Bury.
 This list is arranged alphabetically by surname:
Bury Metropolitan Borough Council is the local authority of the Metropolitan Borough of Bury in Greater Manchester, England.
 It is a metropolitan district council, one of ten in Greater Manchester and one of 36 in the metropolitan counties of England.
 It provides the majority of local government services in Bury.