Dagenham and Rainham

Dagenham and Rainham is a mostly suburban constituency located on the outskirts of Greater London. It contains part of the town of Dagenham and the neighbourhoods of Rainham, Becontree Heath and South Hornchurch. The area has an industrial heritage and the population grew rapidly in the interwar period. The Ford Dagenham automotive factory located in the constituency once employed over 40,000 people.^[2] High levels of deprivation are present in the constituency,^[3] particularly in Dagenham and Becontree Heath.^[4]

Residents of the constituency have low levels of education and professional employment compared to the rest of the country. Average income and house prices are similar to nationwide figures but considerably lower than London averages.^[3] At the 2021 census, White people made up 58% of the population, similar to the London average. Asians and Black people were 18% each.^[5] The increase in ethnic diversity in the area is recent; the proportion of White British people in the Borough of Barking and Dagenham fell by 31.4 percentage points between the 2001 and 2011 censuses, the largest change in the country.^[6] At the local borough council level, Dagenham and Becontree Heath are represented by Labour Party councillors, Rainham by Conservatives and South Hornchurch by a local residents' association. Voters in the constituency overwhelmingly supported leaving the European Union in the 2016 referendum; an estimated 70% voted in favour of Brexit, making it one of the top 25 most Brexit-supporting constituencies out of 650 nationwide.^[3]

Before 1945 the Dagenham area was part of the Romford constituency. The MP for the latter seat since 1935, Labour's John Parker, continued to represent Dagenham until 1983. Parker was the last serving MP to have been elected before the Second World War, and with 48 years in Parliament, was the longest-serving Labour MP in history, a record he held until December 2017. The seat was first contested in the 2010 general election which resulted from the Boundary Commission's report that recommended merging the majority of the former constituencies of Dagenham and Hornchurch and added to existing electoral wards a small part of River ward was also transferred from Barking.

In 2010 Labour's Jon Cruddas took the seat gaining a marginal 5.9% win, facing a strong nominal (ward-by-ward) Lab–Con swing measured against the previous forerunner seats and candidates. BNP candidate Michael Barnbrook came third with 11.2% of the vote, his party's second-best showing in the election. In 2015, Cruddas, incumbent won an 11.6% majority; the runner-up party changed to being UKIP closely followed by the Conservative candidate.

In 2019, Cruddas' majority was cut to just 293 votes, the lowest Labour majority in Dagenham ever, which has been represented by Labour MPs since 1945.

The electoral wards in both boroughs were redrawn in 2022 and subsequently the constituency no longer aligns with ward boundaries.

• List of parliamentary constituencies in London