Marco
Many thanks. I have now upgraded to the 1.0.0 - I'm still unlicensed (waiting until I can get the build working).
The build appears to get to the App Store Connect now and is processed succssfully - but doesn't get to TestFlight -
The following message comes from Apple -

Missing beta entitlement - Your app does not include the beta-reports-active entitlement. If you intend to distribute this build via TestFlight for beta testing, please re-build this app with an App Store Distribution provisioning profile. Do not use ad-hoc profiles.

I am building with:
Package Distribution: iOS App Store Distribution
Signing Identity: iPhone Distribution: in my name
Provisioning Profile: iOS Provisioning Profile (Distribution)