In this clip from T2 Trainspotting, the forthcoming followup to Danny Boyle’s 1996 hit about Edinburgh heroin addicts, two of the four friends have a rather more successful trip up Arthur’s Seat. Ewan McGregor’s Renton counsels Ewen Bremner’s Spud to channel his addictive tendencies into something more productive than hard drugs

• T2 Trainspotting opens in the UK on 27 January