https://www.slab.org.uk/guidance/nominated-solicitor-ceasing-to-act-for-assisted-person/
You can stop acting for the assisted person receiving criminal legal aid at any time [regulation 17(1) of the Criminal legal Aid (Scotland) Regulations 1996].
If you decide to do so, you must:
As Lord Osborne observed in McKinstry v Council of the Law Society of Scotland 1997 S.L.T. 191 (1996 S.C.L.R. 421)
“Regulation 17 is in the following terms: [his Lordship quoted the terms of reg 17 and continued:]
I did not understand there to be any dispute between the parties as to the broad effect of this regulation. Paragraph (1) imposes certain duties upon a nominated solicitor who determines that “he should cease to act for” an assisted person. The language of this regulation plainly recognises that there will be circumstances in which a nominated solicitor may properly decide that he cannot continue to act for an assisted person. It also recognises that the decision as to whether the nominated solicitor should continue to act for the assisted person is one for the solicitor himself who may “determine” that he should act no more.”