The commentary doubles as a synopsis, and is reproduced below:

Like most of us, miners are fond of fish and chips. Four hours out from Grimsby, the 'Darwen' is trawling for fish in the North Sea. Coal keeps these trawlers going to get our fish.

Down go the nets, and the trawl doors that keep the nets open to let the fish in. Now it's time to haul the nets in. This is heavy work, even on a fine day like this. Cod, plaice, dab, turbot and sole - and that cannibal is a monkfish. The fish are gutted, and afterwards there's something for the seagulls that follow the fleet.

This routine goes on for two or three weeks, and it's not always fine - there's bad weather coming up. Now the deck is slippery and the vessel pitches as the crew struggles with the nets. All this is worth remembering next time you buy a piece of fish.

Fourteen days of this, and now homeward bound. While the nets are being mended, bearings are taken on the navigational beacon. This gives the skipper his direction.

Here's the fish. It's a good catch, and the baskets are stowed away in the hold. In the cold half light on a raw morning, the catch is unloaded at Grimsby fish market, and the 'Darwen' takes on coal for another trip. Within 48 hours she'll be away again to bring back more fish for your coal.