Colin McAllister and Justin Ryan head to Harrogate for the fourth instalment of their adventure in renovating and selling homes. They decide to buy a 1950s four bedroom house for L240,000 but project manager Nigel Leek has his doubts over whether they can actually design a family property. Tensions increase as the spend for the renovation goes up, and with the house sitting on the market, Colin and Justin have to face some home truths. Series producer Jane Merkin (S)