Picking up the baton from Sir David Attenborough’s Wild Isles, Countryfile launches 'Wild Britain', an ambitious 12-month initiative to galvanize us all to help and save our precious wildlife. Ellie Harrison and Hamza Yassin are lending a hand on the Lincolnshire Fens, as a group of local volunteers and school children begin the transformation of an old playing field into a wildlife haven by building a bog, a dead hedge and a bug hotel. Hamza also takes the children on a wildlife safari at a nearby nature reserve to show what nature their playing field could attract in a few years’ time. Twenty years after his first visit, John Craven heads to Chester Zoo to discover how our smallest rodent, the harvest mouse, is getting on and takes a trip on the Macclesfield Canal to find out how we can all create our own wildlife haven, no matter what size of space you have.