A regional political editor has left his role after a year to take up a new post with a different publisher.

Josiah Mortimer has announced his departure from MyLondon, which he joined as City Hall editor last year.

As a result of the move, Josiah has also stepped down from his post at City Hall Journalists, a Westminster lobby-inspired group he founded in June for reporters who cover London’s local politics.

London World acting editor Jessica Frank-Keyes will take over the group’s running as a result of Josiah’s departure.

Josiah, pictured, is set to move to a senior political reporting role outside of MyLondon publisher Reach plc in the new year, but has yet to reveal further details.

Posting on Twitter, he said: “Sad to be leaving the excellent City Hall beat but CHJ is in good hands with Jess.”

Speaking of her new role, Jessica added: “Thrilled to be taking the reins at City Hall Journalists covering the London Assembly – big shoes to fill.”

Josiah previously served as editor of left-wing political news and comment site Left Foot Forward.

He had held that role for four years after completing NCTJ training at News Associates.