The vendor of the development software was unable to resolve the Nexus 7 issue but luckily I was able to work it out myself.
The Mac Mini is all set up so I was able to deploy the app to my iPad and the wife’s iPhone with no issues.
Fully registered as a developer for Android (£25 one off fee), Amazon (free) and iOS (£79 a year) now so the app will be released on all three platforms.
Moving on Monday so packing everything at the moment with little time to finish the last parts of the app (rewrite content, create some short scenarios).
Will post again in August.