My dad is a judge :).
But not British, so this may not help!
He is very extroverted, kind, compassionate, thoughtful,intuitive, brainy, logical, very keen on sports, good at law/logic but not maths/science. He still loves the law (his ID twin also became a lawyer).
I wouldn't say he's jaded about humanity... but he's not able to take sad or violent films or stories -- he gets too much of that IRL. He's very down on the prospects of anybody who might have suffered FAS, he's convinced that's the explanation of most of the hopeless cases he sees, people who were doomed to be F*'ed up from birth.
The Myers-Brigg personality test my dad took on some judge's workshop and said that he found out that he was a very unusual judge in being "perceptive" rather "judgement" category.
My step-mum is a magistrate (again this is abroad), she is very like my dad in background, outlook and interests, but more outraged about injustices in the world.