The Hairy Bikers take their longest trip in the baking series, from Cornwall to Scotland.
Dave and Si start in the far south west, cooking traditional pasties at Geevor tin mine in Cornwall. Once made, the pasties - and the boys - face the ultimate test: the locals. Are the pasties good enough to impress?
They then head northwards to the Midlands and visit an orchard in Abberley, Worcestershire, to produce an apple pie. From there it's on to Melton Mowbray, where they try their hand at making pork pies.
Heading north, the boys' journey takes a detour via Dave's house, where they rustle up two of their favourite pies. For Si it's a chicken and wild mushroom, while Dave opts for a more humble cheese and onion pie.
Finally they travel to Huntly in Aberdeenshire, where the hungry duo sample an extraordinary range of pies - Scotch pie, macaroni pie, and mashed potato and baked bean pie.
The journey ends on the banks of the River Deveron. There they cook a salmon coulibiac - a whole fish stuffed with prawns and wrapped in filo pastry - and feed it to pipers and Highland dancers.