In episode five, Griff visits Mid Wales where he pans for gold, trampolines in the middle of an estuary, learns more about a legendary sunken kingdom and embarks on a search for the Holy Grail. Mid Wales is famous for its myths and legends as well as its winding river and stunning coastlines. Describing the area, Griff says: “This region has one of the lowest population densities in the whole of the country. Limited road and rail connections mean that it is also one of the most inaccessible parts of Wales and it’s these factors that lend this area a certain other worldliness.” Griff starts his journey deep in the countryside in a tree house which can be rented as a holiday cottage. Here he receives his challenge for this week - to track down the Holy Grail – the drinking vessel supposedly used by Jesus at the Last Supper.

• Griff Rhys Jones