The trial will compare the drugs olaparib and cediranib with standard chemotherapy in BRCA1/2 mutated platinum resistant ovarian cancer. Patients will be randomised to one of three treatment groups: olaparib only, olaparib and cediranib and the control group paclitaxel. The aim is to compare efficacy of the 3 treatments and also how well each treatment is tolerated including the participants quality of life.