Harmony test for downs syndrome

Has anyone had the harmony test done in the Harris Birthright centre in London?

I was just wondering how long it took for the results to come back and whether they called you to tell you or called you in for an appt to tell you?

I would assume if you come back as high risk they will call you in to an appointment but has anyone had it come back clear and been told over the phone?

Keen to find out as soon as possible obviously and driving myself mad!

Thanks!!