Never Let Me Go has been described as a story about lies and deceit. To what extent do you agree with this view? How does Ishiguro present lies and deceit? How does Ishiguro use lies and deceit to explore some of his ideas about people?

The entire premise of Ishiguro's narrator's life (and the lives of her friends and classmates) is based on lies and deceit. Kathy, the narrator, is part of a group of young people who are basically bred to donate their organs to others. They are educated together and told lies and misinformation about the outside world as they gradually become aware of the horrific truth.
Kathy only reveals the truth of her and her classmates' roles gradually over the course of the novel, as she narrates in retrospect as an adult. She thinks back to her time at Hailsham, the school where she and her best friends, Tommy and Ruth, grow up. Kathy does tell us at the start that she is a "carer," but we don't understand the context of that term until later in the novel. As the students attend Hailsham, they notice some mysterious details, such as the odd artwork requirement and the strange behavior of Miss Lucy, a teacher who seems to know things that she cannot share with her students. There is also a sense that Miss Lucy disapproves of something about the school.
Later, we learn that Ruth and Tommy are "donors," meaning they donate their organs in a series of operations until they "complete," or die. Some donors last for all four operations, while others do not make it so long. Kathy's role as a "carer" is to care for the donors before, during, and after their operations and recoveries. It seems as though the donors basically live in hospital facilities once their donations begin. For all intents and purposes, their real lives are over. This relates to lies and deceit simply because the donors and carers are not aware of the full extent of their roles and responsibilities during their time at school. 
Within this larger premise that is based on deceit, the characters sometimes deceive each other in ways that affect their interpersonal relationships. For example, Ruth tells Kathy that Tommy does not have romantic feelings for Kathy, and this keeps Kathy and Tommy apart for most of their lives. They eventually do admit their feelings to each other and try to pursue a deferral of Tommy's donations so they can have more time together. Unfortunately, Tommy completes after his fourth operation, leaving Kathy as the only of the three friends still alive to tell the story. This romantic subplot allows us to see the humanity in Ishiguro's "donors" and "carers," as much as some of the other "normal" characters try to deny it.
Never Let Me Go is a dystopian novel that imagines what would happen if scientific technology, like cloning, were taken to an extreme point. We are left wondering, what are the effects on these "donors" and "carers"? To what extent can they be considered human? What responsibilities do we have to these creations once we bring them into the world? Ishiguro, through his sympathetic portrayal of Kathy and her friends, suggests that the deceits and half-truths perpetrated on these young people throughout their short lives only exacerbate the tragedy of their pre-determined fates.