This week Dom and Sheree are on the outskirts of Cardiff, helping a family who have been left to freeze and live in a half-finished extension with no central heating for three years.

Care-worker Julia wanted to extend her home to make room for her ageing mother Mary, who had just returned from living in Australia after having a heart-attack. She contracted a builder, the son of someone she thought was a friend, and paid him £64,000 to build a two storey wraparound extension. Six months later, the builder left the job, taking all her life savings and leaving Julia, her mother Mary and her teenage son Chris with an open shell of a home.

While Sheree struggles to make her budget stretch far enough to finish this massive job, Dom investigates the cowboy and discovers he may have fled to Thailand. He also meets other victims of the same builder, including a man whose life has fallen apart after the builder left his sewage system leaking into his garden.