Ok, so that scene of Hugh Grant at the hospital last episode WAS a flashback - seems like a cheat, making it seem like he was there at that time. Now I know this is the kind of show where I can't trust what they show us, which is annoying. They should have made that more clearly a flashback.
Yes, once the lawyer friend had taken his case, she's bound by privilege, but is she bound by privilege if he asks her to take his case and she says no? Why would she ever say yes to representing her best friend's husband without her best friend's knowledge, especially on a sexual misconduct charge?