TV tonight: tense times with biscuits in the Bake Off tent

The humble digestive is elevated to ancient wonder status in the competition. Plus: the US version of Doc Martin. Here’s what to watch this evening

8pm, Channel 4
With a place in the final six at stake, the four remaining teams must produce two dozen perfectly executed savoury millefeuille and babka buns. Before that happens, they’re tasked with creating intricate biscuit showpieces inspired by the ancient wonders of the world (hanging gardens of bourbon, anyone?) accompanied by elegant petit gâteaux. Ali Catterall