23AUG

Durham councillor joins UK Social Democratic Party

2 min read

19:09UTC

Jack McGlenen, elected for Reform UK in 2025 and latterly an independent, now sits for the UK Social Democratic Party on Durham County Council.

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PoliticsDeveloping

Key takeaway

A Durham ward keeps a councillor who no longer carries the label he was elected under.

Jack McGlenen, councillor for Dalton and Dawdon on Durham County Council, has left independent status for the UK Social Democratic Party (SDP), a small British party with no connection to Germany's Social Democratic Party (SPD). Open Council Data logged the move on 20 August, a date that records when the tracker updated its entry rather than when the change was made ¹.

The party said McGlenen was elected for Reform UK in May 2025 and later sat as an independent ². The SDP also picked up Rhys Carr in Wakefield, logged on 6 August, giving it former Reform councillors on two separate councils . Two members across two authorities is a foothold rather than a bench, and it is how minor parties usually acquire one.

British local government has no recall mechanism and triggers no by-election when a councillor changes party. Dalton and Dawdon therefore keeps a member elected under a label he no longer carries, until the seat is next contested, and nobody who voted there in 2025 was asked about the change. McGlenen had already left Reform before this switch, so the move adds a party to a seat rather than a name to the running count of Reform departures that Mark Pack put at 56 on 3 August , a count in which no elector removed anybody.

Deep Analysis

In plain English

Councillors are sometimes elected under one party's banner and later change allegiance without a fresh election, either becoming independent or joining a different party partway through their term. This does not remove them from office. Only voters at the next scheduled election can do that. Jack McGlenen followed exactly that path. Elected for Reform UK in May 2025, he later sat as an independent, and has now joined the UK Social Democratic Party, a small party unrelated to Germany's Social Democratic Party (SPD) despite the similar name.

Deep Analysis

Root Causes

Open Council Data logs the date a councillor's party affiliation changes in its own records, not necessarily the date the councillor or the party announced the move. Its 20 August entry for McGlenen is a record-update date, and neither the council nor the SDP's own website independently confirmed an announcement date.

McGlenen had already left one insurgent party for independent status after his 2025 election for Reform UK, so he had already shown a willingness to move again. Choosing a small established party rather than staying independent suggests he wanted a party structure, not simply distance from Reform.

What could happen next?

Meaning
McGlenen's move adds to a small but recurring flow of Reform-elected councillors drifting toward minor parties or independent status rather than staying put.

Source Landscape

This story draws on neutral-leaning sources

Primary parallel: Today's UK Social Democratic Party (SDP) uses the name of a party a 'Gang of Four' of Labour defectors, Roy Jenkins, David Owen, Bill Rodgers and Shirley Williams, founded in 1981. Most of that party merged into the Liberal Democrats in 1988; the smaller faction around Owen that refused the merger wound itself up in 1990. The present-day SDP is a much smaller, later organisation using the same name and registration, not a continuously governed successor to the 1981 party.

Counter-parallel: McGlenen is joining an established small party rather than founding one, so his move is better read as one councillor's choice of a minor-party home after leaving Reform, not as evidence of a wider three-party realignment on the scale the 1981 breakaway briefly achieved.

Sources:Open Council Data UK·Social Democratic Party

Mentions:Reform UK →Liberal Democrats →Social Democratic Party →Democratic Party →Mark Pack →Wakefield →Germany →

First Reported In

Update #16 · Reform loses three wards, wins Clacton

Open Council Data UK· 23 Aug 2026

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Causes and effects

Caused by

Carr takes his Reform seat to the SDP

Rhys Carr's 6 August move from Reform UK to the SDP set the precedent McGlenen's defection followed.

Occurred 6 Aug 2026

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Reform sheds 56 councillors since May

McGlenen's move extends the councillor-departure tally Pack had put at 56 since May.

Occurred 3 Aug 2026

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Carol Ney quits Reform over a post

Carol Ney's 7 August departure from Reform's Plymouth group is part of the same defection pattern McGlenen's move continues.

Occurred 7 Aug 2026

Read story →

This Event

Durham councillor joins UK Social Democratic Party

A second former Reform UK councillor reaches the same small party without any ward being asked about it.

Different Perspectives

Ian Davidson, Acting Returning Officer for Clacton

Davidson's office printed a 90cm ballot paper for the record 34-candidate field, with nothing in electoral law capping candidate numbers or the £500 deposit each pays. He expects the paper's size to raise printing costs and slow the count into the early hours, a strain that follows from the major parties' boycott, not from turnout.

Scottish Labour members

Members now choose between Michael Marra and Joe Fagan after Monica Lennon fell one MP nomination short of the three-MP, three-MSP threshold, a bar set by MPs and union officials rather than the wider membership. Whoever wins takes office having faced only one rival on the members' ballot.

Labour Party

Labour gained Penistone East from Reform on 20 August but lost Harraby South to Reform the same night, a wash that undercuts any claim of momentum. The party can point to beating Reform in a genuinely fought contest, but not to a pattern running only in its favour.

Liberal Democrats

The Liberal Democrats took two of Reform's May wards, Almondbury on 13 August and St Neots Eynesbury on 20 August, the latter on a 29.8-point rise in their own vote share. Both results let the party claim it is the beneficiary when voters turn against Reform, not Labour or the Conservatives.

Reform UK

Reform UK can point to winning Clacton unopposed by the other major parties and to taking Harraby South from Labour, a ward it had never previously contested. That gives the party two results to cite even as three previously held wards changed hands elsewhere in August.

Sinn Féin

Sinn Féin's John O'Dowd ruled out a Stormont walkout on 11 August despite calling the DUP increasingly difficult to work with, closing a question Conor Murphy had left open a fortnight earlier. Only Sinn Féin or the DUP can collapse the joint First Minister office, so the denial gives up the party's own leverage in budget talks.