BBC Four HD

Programmes start at 7.00pm.

Monty Don visits the world's 80 best gardens. He visits South America, a continent twice the size of Europe with 50,000 endemic plants.

Richard Hammond investigates the role water plays in the weather. He tries to weigh a cloud, finds out how rain could crush a car and starts an avalanche.

Secret recordings expose corruption between cops and armed robbers. Contains some strong language.

As fans prepare for the arrival of series nine of the BBC's long-running crime drama Shetland, actor Alison O'Donnell takes an affectionate look back on the series.

A severed hand washes up on a Shetland beach, sparking a complex murder investigation. Contains some strong language.

Travelling across Shetland, Ben Fogle meets people whose lives are rooted to these islands' history and visits a tiny church with big ideas.