The firm has a new senior management team of three partners: Ann Logan, Robert Holland and Alan Gilfillan.

The firm was previously led by executive chairman Elaine Motion, who remains as chair of the partnership and will work closely with the new team. Mrs Motion led the historic Brexit case, which resulted in the Supreme Court ruling Boris Johnson’s prorogation of Parliament was unlawful.

“Elaine has done a fantastic job as executive chairman, while also doing very demanding and high-profile client work,” said Ms Logan, a litigation partner.

“She was keen to hand on the executive reins as part of a long-term succession planning strategy, while remaining as chair and continuing her high-profile client work. The partnership decided that a senior management team of three was the best structure - and the three of us were elected in a free vote of the 23 partners.”

Mr Holland, head of employment, added: “Elaine has a high profile as a result of the Brexit cases and this is a perfect time to capture that as she concentrates on a more outward-facing role as chairman. At the same time, the new team will look to draw heavily on her experience as we work together to drive the firm to the next level.”

Mr Gilfillan, a commercial law partner, said: “The three of us have different expertise and skills and it’s important that we represent a wide cross-section of the business. Balfour and Manson is renowned for its litigation team but we are a full service firm with strength in all areas.”

The new team will be supported by finance director Ken Dinneen and HR director Margaret Peet.

“We have a very experienced support team in place as we shape the future of the firm in all the key areas,” said Ann Logan. “Our focus as a new team will be ensuring we have the right people to deliver a strong pipeline of work across the whole business, building a modern IT infrastructure to support what we do and having a strong profile in the market-place to attract new business.”

Mrs Motion said: “Ann, Robert and Alan are great lawyers and excellent leaders and I look forward to working with them to build an even stronger future for Balfour and Manson.”