Melissa Porter and Rhodri Owen search Britain to find the best property in three price brackets: a quarter of a million, half a million and a million pounds plus. Melissa and Rhodri go back to the classroom as they search for Britain's dream school conversion. Rhodri thinks a former school in Swindon is worthy of top marks, and Melissa's choice in Wallingford comes complete with the original library. But will they match up to a jaw-dropping million pound-plus conversion in Battersea?