Both departures mean more than a third of the Labour Senedd group, 12 out of the 30 members, are quitting the parliament next year.

In a statement, Hutt said it was a difficult decision to make but she would be working as hard as ever over the next 16 months, “standing up for the Vale, for Wales and for the social justice principles and values that brought me into politics”.

Hutt thanked the people of Vale of Glamorgan for their “wonderful support, friendship and opportunities” over the last 25 years as their elected Welsh Parliament member.

She said it had been an honour and privilege to represent and serve her constituents in every part of Vale of Glamorgan.

“I have also been very fortunate to be given the opportunity to serve in the Welsh government over this period helping to shape and support policies and laws to meet the needs of Wales,” she added.

Currently serving as the government’s counsel general and minister for delivery, James had previously been responsible for local government, housing and climate change.

James described her time representing Swansea West since 2011 as the “privilege of her life”, adding that it had been “an honour” to serve in the Welsh government since 2017.

“I am deeply grateful for the trust and support I have received over the years – I will always look back on this period with immense gratitude to everyone who has worked so hard alongside me,” she added.