Atmosphere and story, both fleshed out by useful expert interviews. James and the Giant Eagle is a great listen. in short, our hero has to place a camera in the nest of a huge eagle.

The admittedly slow, wordy beginning maintains you thanks to the jungle atmosphere and field narration.

Maintaining that jungle backdrop even to the office-bound experts is an interesting example of an essential Radio 4 technique — dropping in the expert.

We’re won over, through field narration and airy context, to the side of the posh-boy adventurer. His concerns about where the beanbag might go chime perfectly with where we’ve been brought. This is even stronger by the time we reach the fight scenes.

Good play is given to sound — did you hear how long that first catapult shot took? Great!

The expertise of host James Aldred is welcome. The necessity of the whole exercise is never quite established, and this is fine, because if you say absolutely everything, you don’t get a radio programme, you get bored.

This is a great half hour from the BBC Natural History Unit and produce Sarah Blunt.

James and the Giant Eagle on BBC Radio 4.