I'm not sure, I'm taking a guess, but it'll likely be dependent on the grading of the murmur, whereabouts in the cycle it's occurring and, probably most importantly, on the initial opinion of the cardiologist, and the results of the echo, if deemed neccessary.
I guess the CAA will be able to tell you more following your initial cardiological consult.
As slim states, these things are sometimes difficult to elicit and interpret objectively, you probably do need the opinion of someone who is doing so on a daily basis.
Thinking about the cost implications, I wonder if it would be worth asking your GP if he has any direct access to echocardiography- it may be possible to combine this with a private cardiac opinion, it may be worth asking.