The Musicians’ Union has nominated Keir Starmer to be the next leader of the Labour Party, and Rosena Allin-Khan to be the next deputy.

The party-affiliated organisation has become the fourth trade union to back Starmer, and the first to back Allin-Khan.

In 2015, the union nominated Andy Burnham for leader and Caroline Flint for deputy, and in 2016 it backed leadership challenger Owen Smith.

Commenting on their nomination on Twitter, the Musicians’ Union said Starmer had been “a strong supporter of musicians”.

“He understands the challenges musicians working in the EU are facing and what we need to do to meet them”.

The organisation also revealed in a tweet that Allin-Khan was a “former Musicians’ Union member” and said they were “proud to see her rise so far” and “to support her as she continues fighting for young people to have a free musical education.”

Starmer has already secured his place on the final ballot through both the support of affiliates, including large trade union UNISON, and the backing of local Labour parties.

To reach the ballot paper, each candidate must be nominated by 5% of local parties or three affiliates, two of which must be trade unions, amounting to more than 5% of the total affiliate membership.

Starmer has been nominated by a total of 159 constituency parties so far, as well as UNISON, Usdaw, SERA, Community, Labour Movement for Europe, Labour Business and the Socialist Health Association.

Allin-Khan has yet to secure a place on the final ballot, having so far only secured the support of 17 CLPs and the Labour Campaign for International Development.