OK :) GOT IT WORKING!!!

I hadn't realized that my export settings for mobile had been set to fantastic, so the pixel light count was 4 amongst other performance killlers. Thanks again for the great support.
Will def refer this onto other developers.

Hey Joachim,

Tried what you suggested , still won't work unfortunately.
Would you mind posting a photo  graph of the simplest way a refraction can be implemented (Bare Minimum).

I opened the Refraction shader, put Alpha to 0, and made the texture a normal map but still just getting a black block on mobile :( If you have any further advice, or maybe an example graph of how you would recommend for mobile, that would be really helpful.

Sorry to double post, but maybe the settings of the Gameobject need to be a specific way.
Are shadows supposed to be on or off etc...

To be 100% honest, I'm just starting to learn about shaders etc...
I used the template Refraction example , and I wouldn't know where to start toning it down.
I can tell you that on mobile, it was just Black.
Maybe that gives some insight into what the problem is?