Martin is a writer, surfer and beach lover. He founded the Beach Clean Network with Tab Parry in 2009 and started the #2minutebeachclean in 2013 after North Atlantic storms left UK beaches littered with plastic rubbish. It's a simple, effective idea - pick up beach litter for 2 minutes, bag it, tag it, bin it - and the mission has been taken up by thousands of people around the world.

Martin is also the author of the bestselling series The Camper Van Cookbook, The Camper Van Bible and The Camper Van Coast and presented the BBC2 show called One Man and his Campervan.

Martin lives in Bude, Cornwall.

TV presenter, photographer and conservationist Chris Packham is one of the nation's favourite naturalists. He is best known for the BAFTA-winning The Really Wild Show and fronting BBC's Springwatch and Autumnwatch. Packham is president of the Hawk Conservancy Trust, the Hampshire Ornithological Society and the Bat Conservation Trust and vice-president of the RSPB and the Butterfly Conservation. In 2011, he was awarded the British Trust for Ornithology's Dilys Breese Medal for his 'outstanding work in promoting science to new audiences', and in 2016 he won the Wildscreen Panda Award for Outstanding Achievement, for his contribution to wildlife filmmaking.

Packham's partner Charlotte Corney owns the Isle of Wight Zoo, and his step-daughter is studying zoology at Liverpool University. He lives in the New Forest.