Thank you Lenin and stellatj for both your verdicts.
So, all in all EBCT is mainly a calcium/plague calculator with the need for further investigatory tests such as angiography and stress perfusion testing, it costs over here approx. £525, expensive but I will still give it a go as I have been having symptoms for over a year now with chest pain, breathlessness and swelling feet/ankle, abdomen which accumlates during the day. I already had an ECT, treadmill test carried out when I was in the cardiac assessment unit after having had continuous chest pains, which were not conclusive.
Not sure if either of you are UK based (most likely the US) as I wondered if on the EBCT positive/negative results showed sufficient calcium and/or a high level of plagues, that the NHS would investigate further by angiography and stress perfusion test. Should imagine so, even if the results are just numbers, the results could not ignored and there would still be a need for these further investigatory tests you mentioned.
Anyway, I shall bear your answers in mind which are v. helpful.