Just looked this up:
If a solicitor identifies a conflict of interest, they are legally obligated to stop acting for one party and this can happen at the start of a case or during its progress. Solictors are supposed to carry out conflict checks to remain impartial before taking on a case to be within ethical practice.
So in theory, JR should constantly remain vigilant for conflicts of interest arising and act accordingly and then advice the clients if they see a problem.
I have to say, if JR is not identifying a problem here, then you have to presume that NHS Fife are fully on board the Good Ship Upton and are happy with the Upton's testimony and JR also doesn't see Upton as damaging Fife's position. Or JR is just flaming incompetent and/or unethical themselves.
Either way, I'm kinda going wtf.