For the week's second visit, Anjana and David are aiming to get their guests to branch out at Chillderness, their unique off-grid site in Powys, complete with tree-top accommodation. Alas, the outdoor toilets mean some of the B&Bers are far from keen to lay down roots. And although everyone has a hoot on a trip to meet some birds of prey, the self-catering breakfast leads to some unsavoury feedback