Charlie Luxton and Sophie Morgan help homeowners resolve their crucial design dilemmas. This time, Charlie is in south London with architect Supriya and operations manager Siddhartha - who have the tricky task of extending their home while managing the twin relationships of husband and wife and architect/client. Sophie heads to Hertfordshire, to join a couple who face a race against time to extend their charming end of terrace cottage before they tie the knot.