Thanks muraria.
I suspected what the 7 letters could be and I woke up this morning with the possible answer for 15-30-7, as I had the grid-fill but not all the letters of the framework, last night.
Incidentally, 7d was my FOI, as I was identifying the unclued, and was surprised it was clued.
You have now confused me with "first letter in row 14", why not the one in row 1, as where it should start?
I have not interpreted the framework correctly, perhaps, I am on the wrong track.