Aiken was one of three
Ulster Unionist Party (UUP) candidates to run in
South Antrim at the
2016 Northern Ireland Assembly election. He was elected on the seventh count, with 3,280 first-preference votes (9.3%), being the only UUP candidate to be returned in the constituency. At the
2017 Assembly election, Aiken was re-elected on the fifth count with 14.8% of first-preferences
Leader of the Ulster Unionist Party When Robin Swann MLA announced his sudden resignation as leader of the
Ulster Unionist Party in 2019, Aiken stood for the leadership. He was
elected unopposed as leader in November 2019 and led the party through difficult periods addressing concerns about Brexit, the Protocol and pandemic. He promptly opted for the UUP to take the Ministry of Health Department, when no other party would take it, and appointed Mr Swann MLA as Minister. He announced his resignation as leader eighteen months later because he held a firm position that the Chief Constable needed to resign in 2021.
Post-leadership In October 2021 Aiken was reselected to be a UUP candidate for South Antrim in the
2022 Northern Ireland Assembly election. He was reelected in the May 2022 poll and, despite the lack of a functioning Northern Ireland Assembly since February 2022, he continues to serve the people of South Antrim and remains the Party Spokesperson on the Northern Ireland Protocol and Finance, in addition to his private consulting business.
Suspension from the Assembly In 2024, Aiken received a two-day suspension from the Assembly after being accused of breaching the "confidentiality" of the assembly complaints process. The standards committee recommended a sanction over Aiken disclosing a complaint he had made against another MLA. On 7 May 2024, MLAs backed a motion to suspend him from attending business on the 13th and 14 May.
Alliance MLA
Paula Bradshaw called on Aiken to consider his position as deputy speaker.
Row with Nuala McAllister On 9 September 2025, while sitting in the chair as deputy speaker, Aiken clashed with Alliance MLA
Nuala McAllister, after she accused of him of "patronising behaviour." This occurred after the
Minister for Education,
Paul Givan, delivered a statement in the Assembly chamber, during which Aiken responded to McAllister's point of order with "just a second, just a second, just a second". Once Givan had finished his statement, Aiken invited McAllister to speak, during which she told Aiken that she "did not need to be patronised." Aiken then asked McAllister to withdraw her remarks, which she refused to do so, and was asked to leave the chamber as a result. ==References==