October 1974–1979 Parliament

1. ^^abcGain retained at the1979 general election.
2. ^^abcdGain not retained at the 1979 UK general election.

February–October 1974 Parliament

1970 – February 1974 Parliament

1. ^^abcdGain not retained at theFebruary 1974 general election.
2. ^^abcdeGain retained at the February 1974 UK general election.
3. ^George Machin retained the seat for Labour in the by-election but lost it to the SNP in the February 1974 UK general election.

1966–1970 Parliament

1. ^^abcdefgGain retained at the1970 general election.
2. ^^abcdefghiGain not retained at the 1970 UK general election.

1964–1966 Parliament

1. ^Gain retained at the1966 general election.
2. ^Gain not retained at the 1966 UK general election.

1959–1964 Parliament

1. ^^abcdefGain retained at the1964 general election.
2. ^^abTony Benn won the most votes but was disqualified by virtue of hisPeerage; the Election Court declaredMalcolm St Clair duly elected. St Clair undertook that if the law was changed to allow Benn to disclaim his hereditary peerage, he would resign and create a by-election. The law was changed by thePeerage Act 1963 and St Clair duly resigned, allowing Benn to return to the Commons in 1963.
3. ^Gain not retained at the 1964 UK general election.
4. ^Edwin Taylor retained the seat for the Conservatives in the by-election but lost it to Labour in the 1964 UK general election.
5. ^A rare occasion when an incumbent government gained a seat from the opposition in a by-election, although it was lost at the 1964 UK general election.

1955–1959 Parliament

1. ^^abcGain not retained at the1959 general election.
2. ^^abGain retained at the 1959 UK general election.
3. ^^abTom Mitchell won the most votes in the1955 general election but was disqualified by the House of Commons on the grounds that he was a convicted felon. A by-election was called at which Mitchell again stood and won the most votes. On this occasion an election petition was lodged and Mitchell was again disqualified with the Election Court declaring his opponentCharles Beattie duly elected. It was then discovered that Beattie was ineligible to sit because he held offices of profit under the Crown. Beattie was indemnified by Parliament against the consequences of sitting and voting while ineligible, and a further writ was moved. In the subsequent by-election Independent Unionist George Forrest gained more votes than Mitchell and duly took his seat. Subsequently Forrest took the Ulster Unionist whip and won the seat in his new party colours at the1959 general election.

1951–1955 Parliament

1. ^^abcAn uncontested by-election.
2. ^TheArmagh by-election was the last time to date when a UK Parliamentary election was uncontested.
3. ^A rare occasion when an incumbent government gained a seat from the opposition in a by-election. The gain was held at the1955 general election.

1950–1951 Parliament

1. ^Uncontested by-election.
2. ^MacManaway had been ordained a priest in theChurch of Ireland in 1925. Before his candidature he sought legal advice and resigned all offices in the Church. However, after his election theJudicial Committee of the Privy Council determined him ineligible to sit, ruling that theHouse of Commons (Clergy Disqualification) Act 1801 disqualified him.