Need a strong UK case authority for a conflict of interest case

UK case law/authority needed for conflict of interest point:

George (name changed) works at two companies- at both places as a part-time employee. Company A & Company B.

Ironically, the law firm for both employers happens to be the same, XYZ employment firm. This is purely coincidental, and employers A & B have no relation with each other.

George is lodging an employment suit against Employer A. When he found out that the defense lawyer's firm of employer A is the same as the law firm that represents employer-B, he protested for the conflict of interest. This is because he still works at Employer-B and has had some conversations with XYZ in the past regarding issues on behalf of Employer-B. Also, Employer-B has passed a lot of information indirectly about George to XYZ law firm and hence George is worried that this will be leaked to used against him in his fight against Employer-A. Moreover, he is worried that the results will be shared with his Employer-B, where he still works and this can affect his job at employer-B.

XYY however denies conflict of interest and has refused to defend Employer-A against George.

Can you find some strong UK authorities to protest with substance and possibly refer to the SRA.

Bonus if they are used by the counsel.

*Below is the email by the XYZ solicitor to deny George the request Not to act for employer-A*

"Dear George

As you know, I have assisted a specific client on a number of matters relating to their patients. Some of those matters have also concerned you, and having briefly reviewed those matters I can see that you have at all times been separately represented. Whilst I have, at my client's instructions, cooperated with you and your solicitors on those other matters, I have not acted for you and you have not been a client of mine or of Colemans.

Accordingly, I do not consider that Colemans are prevented, at all or by reason of conflict of interests, from acting for our clients on any matter that might be contrary to your interests.

I trust this clarifies the position but if you do wish to discuss it any further please let me know. I am of course very happy to provide you with details of our complaints process should you consider this necessary.

Kind regards"

Sir kindly solve the problem please with your sharp knowledge. It will very helpful for me.

Thanks.

Waiting for your best answer.