Small update
Having done some research it eeems that the D-Dimer test is more valuable as a diagnostic tool when the results are negative, rather than positive, so maybe that result goes into the "so what" category.
Some interesting new expert advice has arrived from the sidelines and it is that somebody relatively young should be pushing for few specific tests (a transoesephgeal echocardiagram (rather than the transthoracic scan that I have booked, a 24 hour ECG, and an Aortic scan) so I can foresee some interesting discussions ahead.
Rick