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This is incorrect.
UK Bar Standards Board
12 Confessions of Guilt
12.1 In considering the duty of counsel retained to defend a person charged with an offence who confesses to his counsel that he did commit the offence charged, it is essential to bear the following points clearly in mind:
…
(b) that the issue in a criminal trial is always whether the defendant is guilty of the offence charged, never whether he is innocent;
(c) that the burden of proof rests on the prosecution.
12.2 It follows that the mere fact that a person charged with a crime has confessed to his counsel that he did commit the offence charged is no bar to that barrister appearing or continuing to appear in his defence, nor indeed does such a confession release the barrister from his imperative duty to do all that he honourably can for his client.
12.3 Such a confession, however, imposes very strict limitations on the conduct of the defence. A barrister must not assert as true that which he knows to be false. He must not connive at, much less attempt to substantiate, a fraud.
You can read more at the following link:
https://www.barstandardsboard.org.uk/regulatory-requirements/the-old-code-of-conduct/written-standards-for-the-conduct-of-profession
Thank you. Goodness that's a complex concept. So if the accused (pleading Not Guilty) tells his defence lawyer on the quiet that he's actually Guilty, said defence lawyer can continue to defend him even though he has been advised of his client's guilt BUT as stated in point 12.3, he will now be strictly limited in terms of his conduct and essentially must not be seen to collude with his client 'to substantiate a fraud'.
I wonder if what this actually means in reality is that the defence lawyer would have his hands tied to such an extent that the only sensible course would be for him to stand down and tell his client to instruct a new defence team (as mentioned in neteditor's post)? I can't see any defence lawyer wanting to continue with a case under such uncomfortable restrictions, especially if he was potentially putting his own neck on the line?