Criteria for discontinuing or modifying allocated interventions {11b}
If the patient is not suitable for DIBH, the standard clinical workflow for free breathing (FB) is followed. The patient will complete the patient experience questionnaire and progress to treatment with free breathing using no breath hold management system and with no further study interventions.Patients are entitled to withdraw consent at any time and will revert to standard of care treatment with RPM/RGSC. Outcome data for these patients will still be collected.