There’s a palpable danger as an armoured personnel carrier laden with Scottish troops part of a convoy snaking its way through the anxious wastelands of Afghanistan.

To alleviate their anxiety and consolidate their camaraderie they break into a military tattoo, keeping beat with boots and giving voice in booming baritone. It’s a harmony of portent.

The harmony is broken by a boom of another kind, an improvised explosive device, and the screen is plunged into darkness.

Fade in on sunshine, the sunny side of the street in Edinburgh, as two of the squaddies step out onto civvy street exhilarated at surviving their tour.

Davey and Ally have high hopes being back home. Ally is set to propose to Davey’s sister, Liz. Davey’s mum and dad are due to celebrate their silver wedding anniversary.

Into all this sunshine and song comes a little rain and discord as an ancient indiscretion of dad threatens destruction of the seemingly idyllic family structure.

Inspired by the catchy tunes of the identical twin brother duo, The Proclaimers, SUNSHINE ON LEITH is a guilty pleasure of a movie, a bit like Mama Mia!, with the lyrics serving to underline and emphasise the soap opera script.

Other than the super songs, the film has a strong suit in the casting of Peter Mullan and Jane Horrocks as Davey’s parents. And the location is lovingly shot – an edifying look at Edinburgh that shows just what a gorgeous city it is.

There’s nothing sensational about the staging – it never quite soars – and the choreography borders on the naf, but, though you might not walk 500 miles to see it, SUNSHINE ON LEITH is a pleasant enough picture inspired by the ear worm melodies and clever lyrics of the remarkable Reid boys. Be on the lookout for their appearance in the film.