Inclusion Criteria:  Adults with dilated cardiomyopathy With and without midwall septal fibrosis on previous CMR  Exclusion Criteria:  Needle-phobic patients that would preclude cannulation for contrast injection and blood taking anyone unwilling to consent anyone with a conventional contraindication for CMR anyone with any condition precluding full participation in the study such as DCM patients with infarct-pattern LGE, or subepicardial LGE or non-septal midwall fibrosis (we will not exclude participants with small volume right ventricular insertion point LGE).