In the FFRct group, all patients who are eligible for CTA will undergo CTA as their default test. Those patients with any coronary stenosis of equal to or >40% data in at least one major epicardial vessel of stentable/graftable diameter will be referred for FFRct. (NB Lesions in distal vessels or vessels of a diameter not suitable for stenting/grafting will not qualify for FFRct if there are no other more significant lesions). In patients in whom FFRct analysis is performed, FFR will be derived for all vessels. The data derived from this test will determine their management strategy. The patients in this arm will not follow the NICE guideline algorithm. Those patients randomised to FFRct with contraindications for CTA will be asked to take part in a trial registry.