Did Matt Baker really say it was in Snowdonia at the start of the show? (clip at end):
https://www.bbc.co.uk/iplayer/episode/b09vjh2v/the-one-show-15032018
Although not as bad as "we did as much as 10km a day" - "it was further than 500 miles, at least 800km!" - "they've been doing it for 1000s of years" (Camino De Santiago for Sport Relief).
Mike