Well it would appear I did. Still I was looking for enterprise deployment issues when I was hunting around for answers and also it coincided when I had to update to Xcode 8 for using Homebrew package manager so had assumed that it was an Xcode 8 issue which is, after all, not officially supported with the 15.02SDK. Actually for that matter deploying SDK apps to the App Store is frowned upon by FMI, but still.
At least its working now.
Apologies if I have wasted anyones time.
This is not a problem for us.
We just wished that FMI would publish an updated SDK for every new Xcode version.