In London, Kirstie Allsopp searches south of the Thames, across Balham and Putney, with Hannah and Ben. After years in rentals, the pair are ready to buy. They have a good budget, but first-time buyers' nerves have led to 40-odd viewings and no deal. Phil Spencer helps Hemani and Nigel, who's from Australia, as they seek a Aussie-proportioned property in the Thames Valley.