Ewan McGregor says he wanted to do heroin while preparing for Trainspotting

"I was young and I thought, f**k it, just do it. And also John Hodge, our writer, was a doctor, so I thought he could probably get us some and administer it so we don’t die.

"I thought I’d do it with Danny.

"I just wanted to get f***ed up with Danny.

"But we didn’t.

"Because of course as soon as we started the first thing I remember doing was meeting heroin addicts in Glasgow.”

And it was meeting those addicts that dissuaded the star from trying heroin after all, as he decided it would be ‘disrespectful’ to those who were genuinely dealing with addiction issues.

He said: "We went up to Glasgow and we worked with this group of recovering addicts called the Calton Athletic Club.

"They have soccer teams and they have five-a-side competitions.

"They kicked our a**e.

"I didn't do heroin and I've never done it but I did think about it.

"It did cross my mind and I did say to Danny, 'Do you think we should do it?'.

"But it just really became apparent that that was a really disrespectful idea to the people we were working with."

Last October, it was reported that a spin-off series, centring on Trainspotting character Francis Begbie, was in the works. 

Carlyle said the ‘prospect of working with Irvine and bringing Francis Begbie to life once more is an absolute gift’.

Welsh added: “Begbie is Begbie and Robert is the long-term friend and collaborator who inspirationally brought the character to life with his incendiary portrayal.

“To say I’m excited at us reuniting creatively on this project is obviously something of an understatement.”