Trainspotting author Irvine Welsh is gearing up for production of his directorial debut feature, Good Arrows.

The mockumentary-style comedy was written by Welsh and his frequent collaborator Dean Cavanagh.

The original screenplay is about a darts player who falls from grace in the in Merthyr Tydfil, South Wales. The old coal mining town is also home to characters including peddlars of the ultimate credit crunch drug, jenkem, made from fermented feces and urine.

Welsh's own production company Jawbone is one of the producers of the low-budget project.

Producers are Welsh, Cavanagh, Joanne Podmore, Helen Grace and Rhian Williams.

Good Arrows starts shooting Aug 24 for four weeks in Merthyr Tydfil.

The cast includes Jonathan Lewis Owen and Ella Smith.

The film's UK television rights have been pre-bought by ITV4.

The film-makers aim to finish the feature-length film before Christmas.