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Silvester once again faces Garrow in the courtroom at the Old Bailey, with their old animosities and competitiveness lurking just under the surface.

Typically, Garrow won't play by the rules – which drives Sylvester to distraction – but there is a grudging admiration there, too.

When Sir Arthur's accusations towards Garrow make him the object of ugly rumour and speculation, Silvester reacts with part delight, part outrage.

But his legal mind is engaged and he crosses the floor to defend Garrow in his hour of need – it's an uneasy truce for both men.

"Silvester's a very ambitious man and he finally recognises that Garrow has the ability to pull things from the fire at the last minute, so he no longer underestimates him," explains Aidan. "This time around there's a mutual respect between the two of them.

"Garrow is very passionate and gets involved in his cases but Silvester thinks he's an idiot to be like that. Living in the 18th century was hard – even those who were wealthy could possibly die at any given time and so everyone was just doing the best they could to get through.

"As far as Silvester was concerned, to spend your life worrying about the wastrels of the world would be a complete waste of energy.

"Silvester's a complicated person. He's still a gentleman with a strong code of his own. He's not a malevolent hater of everything but he does want to win and he does want to be the best so he does enjoy the opportunity to put Garrow in his place, when he can.

"It's great to have a good barny and there's more of that this time around, plus I think Garrow is a little more distracted by outside political pressures and personal issues so I get to win occasionally, which is just fantastic.

"This series' stories are very interesting from the perspective of how they reflect on certain issues from today and how they would deal with it back then.

"For instance, there's a case which involves sea men and how they're being treated and not being given the right equipment or not being looked after properly after they've served their country – all of which is relevant today – and I think that's the genius of the writing in Garrow's Law."