All at sea

Guy Martin tests his mettle as an RNLI volunteer...

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What does it really take to work as a deep-sea miner, a dairy farmer or an HGV-recovery driver? Motorcycle racer turned TV presenter Guy Martin aims to find out in the second four-part outing of his Proper Jobs series on U&Dave, as he tries more of Britain's most challenging trades and learns from the everyday heroes who do them.

He's in at the deep end in this week's first episode when he joins the volunteer RNLI crew at the busy Humber Lifeboat Station near his home town of Grimsby.