TV Guide Yesterday Tuesday

The historian investigates the complex factors that shaped the dark imagination of a refined Devonshire lady, discovering family secrets and a childhood haunted by a sinister figure. Focusing on the first third of Agatha Christie's life, this episode unearths the surprising roots of her most compelling themes, the inspiration for some of her greatest creations, and the secrets that the enigmatic Christie herself kept carefully hidden from public view

Michael Portillo crosses the Severn to begin a trip along the south coast of Wales, joining maintenance workers on a hair-raising secret railway high above the estuary. From Newport, Michael makes for Caerleon, where he discovers how its Roman history was eclipsed by the legend of King Arthur and his Round Table

Michael Portillo continues his south Wales coastal railway journey in Barry Island, where he joins a Bristol pilot on his way to help guide a feeder container ship into port. Skirting the Glamorgan Heritage Coast, Michael alights at Llantwit Major to visit St Donat's Castle, before reaching the pretty seaside resort of Porthcawl

Michael Portillo's coastal rail journey along the south coast of Wales reaches the town of Port Talbot, where he investigates how the steel industry is planning to decarbonise. Across the Bay, Michael arrives in The Mumbles, site of the world's first passenger railway in 1807, before making his way from Gowerton to Burry Port and heading for the wild and blustery Pembrey Sands

Michael Portillo travels the rural coastline of Carmarthenshire and Pembrokeshire in south Wales. From Carmarthen Bay, he tracks up the estuary and River Towy to the historic town of Carmarthen and Middleton Hall, home of Wales's National Botanic Garden. There, Michael is on the trail of the quarter of a million honeybees that live in the garden

The final episode examines the infamous Night of the Long Knives in late June and early July of 1934, when Adolf Hitler - urged on by Hermann Goering and Heinrich Himmler - ordered a series of political executions on those seen as a threat to the Nazi regime. The most well-known of these was Ernst Roehm, commander and co-founder of the Sturmabteilung, the Nazi Party's militia, whom Hitler had come to see as a potential rival. At least 85 people died during the purge, although the final death toll may have been in the hundreds

Fiona Bruce presents the show from the historic Buckfast Abbey in Devon, where experts examine an 18th-century tankard, an iron chest with a hidden lock dating back to the 1640s, London street signs, a Biba frock, and a piece of shrapnel from the battleship Bismarck

Fiona Bruce presents the show from the Concorde Hangar at the Aerospace Bristol museum, where the most surprising item brought in is a very valuable statue of Buddha. Other finds being valued include an intricate model of a vintage car made by a prisoner of war, an Elizabethan ring, a collection of classic guitars, and of course, a great variety of Concorde memorabilia

The final episode examines the infamous Night of the Long Knives in late June and early July of 1934, when Adolf Hitler - urged on by Hermann Goering and Heinrich Himmler - ordered a series of political executions on those seen as a threat to the Nazi regime. The most well-known of these was Ernst Roehm, commander and co-founder of the Sturmabteilung, the Nazi Party's militia, whom Hitler had come to see as a potential rival. At least 85 people died during the purge, although the final death toll may have been in the hundreds

On the evening of December 3, 1926, Agatha Christie left her home in Sunningdale, Berkshire, in her Morris Cowley. Ten days later, Agatha was discovered in a hotel in Harrogate, claiming to have lost her memory. Lucy Worsley delves into this traumatic, watershed moment in Christie's life. She visits the key locations, from the chalk pit where Agatha crashed her car to Abney Hall, the grand house where she took refuge (and which would inspire several of her books)