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John Southouse is both enormously proud of and mightily infuriated by his old pupil, William Garrow. Acting as his attorney is, by turns, a joy and a torment – Garrow just won't do as he's told. The apprentice is challenging the teacher.

More conservative by temperament, Southouse battles to keep Garrow on course – he is a barrister at the bar, not a revolutionary on the barricade.

And when Garrow's relationship with Sarah Hill (ill-advised, in Southouse's opinion) threatens to undo everything that Southouse has achieved, he is furious at Garrow's behaviour.

"Garrow and Southouse's relationship is as strong as ever," explains Alun. "At the beginning, I'm washed up because of certain tragedies in my life, and Garrow has been away, so we're reunited and quickly become a great team again.

"I'm still preparing cases for Garrow to argue. I'm an 18th-century attorney so I'm really a cross between a solicitor and a detective, as I actually have to go and find evidence to support our cases.

"Southouse is very old fashioned. He's older and wiser than Garrow, from a different generation who very much acts like a father figure to him. So Southouse is very suspicious and critical of Garrow's dalliance with Lady Sarah at first. I'm the first one they have to win over before they try to make society see them for who they are.

"He's like a surrogate father to Garrow and sometimes he has to say 'enough is enough' – if I don't speak out he could end up in trouble. But it's a great twist for Garrow to find himself in jeopardy in this series.

"There's a much stronger character drive to series two, so the stories are very strong. Tony Marchant is a master at writing scripts and creating stories.

"There is a fascination about the law but I think Garrow's Law has an added interest to it as it gives you an idea of where our laws came from.

"It's based on the cases of actual trials from this time in history. The series is a wonderful combination of fact and fiction and appeals to people right across the board."