So when the dust settles - nobody appears to have gotten interstitial ads working on Construct. I've read numerous "it should work" or "I know a guy who got it working" responses to threads but no actual first-hand experience walk-thrus.
Looks like this myth is 'busted' - <img src="{SMILIES_PATH}/icon_e_wink.gif" alt=";)" title="Wink">
Thanks all.
You can have a look at one of my games to see it working:
https://play.google.com/store/apps/deta ... s.squircle
This was done using Admob, Mopub and CocoonJS. The game has a banner ad, and an interstitial is shown when a game ends and you press the button to return to the menu.