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Then when Finn was five, inspired by Alastair Humphreys' book Microadventures, they attempted to sleep out under the stars in just a bivvy bag for one night of each month of the year.

Some of the wives of the male volunteers expressed concerns and suspicions about her doing a bivvy exercise with them on the fells, which Penny laughs about.

They then received word that Declan was going to sleep on the top of a Munro until morning in a bivvy bag as he was too far away to reach a road - so they ran back down the mountain.

Ultramarathon competitors are used to "roughing it" in races, sometimes sleeping in bivvy bags at the side of muddy trails or even running through several nights.

They tackled a multi-pitch route on the Marmolada—and ended up having to unexpectedly bivvy there overnight.