Nice one for the tip. I did have a good software program for getting back deleted data, but this is a case of them simply not being read full stop. I put them in the camera it says can not be used, try in the laptop it does not even know they exist. Tried a card reader via USB and the same.

Will give your test disc a go but tbh not holding my breath.
Cheers all the same. Will get back to you if it works.