UK parliamentary by-elections since 1945
This list notes the number of by-elections by session since 1945-46 together with a list of the the successful candidates in by-elections since 2005.

Elections to the Northern Ireland Assembly on 5 May 2016 resulted in little change in the party composition. Following the elections the two largest parties in the Assembly remain the DUP (38 MLAs) and Sinn Féin (28 MLAs).
Northern Ireland Assembly Elections: 2016 (417 KB , PDF)
Elections to the Northern Ireland Assembly on 5 May 2016 resulted in little change to the party composition. Changes to the number of Members for individual parties comprised one or two seats.
Following the 2016 elections the two largest parties in the Assembly remain the DUP (38 MLAs) and Sinn Féin (28 MLAs).
108 Members were elected by Single Transferrable Vote, 6 Members for each of 18 constituencies. The Democratic Unionist Party had the highest share of first preference votes in 11 constituencies, Sinn Féin in 5 and the SDLP in 2.
30 women were elected to the Assembly; 27.5% of MLAs are women, the highest number and proportion ever
The People before Profit Alliance won two seats, their first in the Assembly.
Turnout was 54.2%, lower than any previous Assembly election since 1998 (based on valid votes).
Northern Ireland Assembly Elections: 2016 (417 KB , PDF)
This list notes the number of by-elections by session since 1945-46 together with a list of the the successful candidates in by-elections since 2005.
A research briefing on the office and role of the Speaker of the House of Commons
A briefing paper on the history of and procedure relating to Royal Assent, not just in the UK Parliament but in the devolved legislatures and for Church of England Measures.