Sir David Attenborough joins an archaeological dig uncovering Britain's biggest mammoth discovery in almost 20 years. In 2017, in a gravel quarry near Swindon, two amateur fossil hunters found an extraordinary cache of Ice Age mammoth remains and a stone hand-axe made by a Neanderthal.

A man has his wallet stolen by an athletic thief in Swindon. A chase ensues.

Skirting the edge of the Cotswolds the line from Swindon to Gloucester runs through the valley of the River Frome – enchantingly known as the Golden Valley. The viewing platform for our 36¾ mile journey is a 2-car class 143 Pacer operated by Wessex Trains. Some of the delights of any journey over this route are the classic GWR stations at Kemble and Stroud, little changed over time. As well as the usual shots of the driver at work, trackside runpasts and station sequences, there are aerial shots taken from a helicopter.