As someone in human medicine, rather than animal medicine, the vet practice came across as absolute amateurs.
You can't go writing perjorative comments like that in patient's notes, people have had the right to read their notes for ages now.
You can't have a SLT meeting that isn't minuted.
You can't ask people to leave without following your policy.
You can't say that you weren't sad someone's dog died, even if you were thinking it.
If your annoying client is a barrister, then all use your common sense and make sure your documentation is perfect or they will have you for breakfast, they do this kind of thing for fun.
And if Alison truly is the rudest person they have ever dealt with, I can't believe they actually run a public facing business as anyone in retail/healthcare can tell you.