Mr Muir, 66, was a founder and senior partner of MML Law based in Dundee’s West Bell St. He practised law in the city for nearly 40 years.

Along with partner Jim Laverty, he built up MML to become one of the busiest law firms in Dundee with thriving conveyancing, family law and criminal law departments while engaging in all things litigation. Mr Muir also established a reputation as an expert employment law practitioner, putting MML firmly on the map nationally for their continuous success in high-profile cases.

During his career, Mr Muir was renowned for representing high-profile clients in high-profile cases. He was a fearless and unique litigator with a determination to secure justice for those he represented. Over four decades he nurtured dozens of young lawyers who have gone on to enjoy successful careers. He is to remain as a consultant with the firm.

One of the many highlights of his career was negotiating with Donald Trump, as owner of the Menie Golf Resort outside Aberdeen.

He recalled: “Dealing with Donald Trump was certainly memorable – in fact, unforgettable. He was certainly immensely charismatic! It is a pity that client confidentiality prevents me from revealing more of our conversation.”

He added: “My biggest disappointment in law was losing an equal pay claim for Perth & Kinross Council women at an Employment Appeal Tribunal. It was a split decision and an absolute travesty that still irks me.

“My best memories relate to the many successes we had for clients and I can enjoy a degree of satisfaction from building up a business which has a happy and stable staff of 25.”

Mr Muir, a keen golfer and guitarist, intends to devote more time to his hobbies. He said: “I am looking forward to spending more time with my family and grandchildren. I also plan to work on my golf handicap and continue in music when not consulting for MML.”

MML partner Jim Laverty said: “It has been a privilege and honour to be John’s business partner. The professional and personal support John extended not only to me but countless others over the years has been incalculable.

“John will continue to be the heartbeat of our organisation and his core values of honesty decency and sense of justice which were the cornerstones at the start of Muir Myles Laverty in 1992 are the driving forces today at MML Law.

He added: “All staff at MML Law are delighted he has accepted the role of consultant, ensuring his extensive legal knowledge and business expertise will continue to be shared and utilised.

“We know he will revel in his Luka Modric role – maybe not the whole 90 minutes but 35 of majesty to keep MML Law at the forefront.”