Good news - sorted the radius to diameter reading on the X axis!

Thanks Rob, it was basically along the lines you suggested. Needed to press 'in/mm' when powering up. This takes into display configuration mode where you can use the <- -> arrows to choose lathe, mill etc. In my case D60-2L. It talks about pressing '1' but I didn't do this and it still offered me the config types. Might be that is to move between axes (X or Z) to specify which axis gets which configuration??
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Then press '.' to save and exit.
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That seemed to be it so to check it out I put a dial indicator onthe cross slide, zeroed the DRO readout then moved 0.5 mm as indicated on the DTI. DRO display read 1.0 mm hence was reading diameter not radius.

Also note the little |`/ symbol next to ABS meaning diameter:
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Happy days.