The first full-length official trailer for Trainspotting 2 has been released.

Set 21 years after the original cult-classic, the sequel reunites the hit film's original cast, including Ewan McGregor, Ewan Bremner and Robert Carlyle, with director Danny Boyle.

The new trailer opens with a reunion between Ewan McGregor's Renton and Jonny Lee Miller's 'Sick Boy'.

Read more: Trainspotting 2 - Ewan McGregor recreates famous Princes Street dash for sequel

Over the strains of Underworld's hit Born Slippy, which featured prominently in the 1996 film, Renton revives his bitter "choose life" motto but with modern references - "Choose Facebook, choose Twitter, choose Instagram and hope that someone, somewhere, cares".

He also refers to choosing reality TV, slut-shaming, revenge porn and zero-hour contracts, before saying: "Choose to smother the pain with an unknown dose of an unknown drug."

The first film, which followed a group of heroin addicts and explored urban poverty, was based on the novel of the same name by Irvine Welsh, while the sequel is based on his book Porno.

In the trailer for the sequel, Renton tells his former love interest Diane Coulston, played by Kelly Macdonald, that he does not take heroin any more, but there are multiple scenes of drug use in the trailer, as well as fighting and dancing.

Renton's narration ends with: "You're an addict so be addicted, just be addicted to something else. Choose the ones you love, choose your future, choose life."

The film has been shot at various locations across Glasgow and Edinburgh.

T2 Trainspotting will be released in UK cinemas on January 27.