He's best known for playing Darren from Love/Hate but Robert Sheehan's big break came when he took on the role of Nathan Young in Misfits in 2009 - a role which he had no regrets about leaving.
"A lot of boll**ks was chatted," he told Digital Spy. "A lot of manure was coming out of my mouth during that time. It was very encouraged of us, the five main actors, to be irreverent and silly and f**k around and have a laugh. They never chastised us more than they absolutely had to. We were always encouraged to be disobeying little twits and I think that really helped the spirit of the show, we felt completely unshackled. It was a glorious time.
"I can't say about where the show ended up, to be honest, because I haven't seen it. I was absolutely quite happy about when I went off, it seemed like a no-brainer at the time, because I was just a restless fella who was trying to go off and do as much different stuff as possible; I'd done two good summers with that show, so was wildly impatient to do other stuff."
The 27-year-old Irish actor is taking on the part of Richard III in the West End production of Wars of the Roses, said he had great concerns about remembering his lines.
"It has been challenging. There was genuine panic, first and foremost, around whether or not I could see myself retaining all the lines. That was genuinely the first concern.
"So I tried my best to quash that concern as much as possible by spending a week in Stratford-upon-Avon before we started rehearsing. I saw Shakespeare's grave, his birth site, saw Trevor's previous play with the RSC and in that time tried to spend every hour of the day learning a piece of the script. So by week two or three I was fairly off book.
"But then the challenge was trying to make it sound as current and as understandable as possible. I realised: the more you chant Shakespeare like you're in f**king church the less people are willing to listen or engage. You have to make absolute sense of what you're saying and then you have to make it as natural as possible."
The Wars of the Roses will be staged at the Rose Theatre Kingston in London until October 31.
