The objectives of this study were to establish the extent to which UK primary care has adopted recommended practices on supportive and palliative care of adults with cancer, and to relate this to participation in national initiatives. We conducted a cross-sectional postal questionnaire survey of a random sample of UK general practices. In total, 60.0% of practices (2096 of 3495) responded to the survey: 61.5% reported involvement with the Gold Standards Framework (GSF); 24.4% with the Liverpool or other End of Life Care Pathway; 12.3%, with the Preferred Place of Care (PPC) initiative; and 8.4% with Advance Care Planning (ACP). Participation in GSF contributed most to the variance in practice organization scores; and practice organization scores contributed most to the variance in clinical care scores. Participation in ACP or PPC, and higher clinical care scores were associated with an increased likelihood of reported high rates of death at home for cancer patients. Our findings appear to support the role of national initiatives in improving the quality of end-of-life care delivery in general practice. A population-based study would be required to assess the effect of end of life care on clinical outcomes and patient or carer experience.