It's an lrf (fortunately). I was directed to another bit of software (ABC....) which worked a treat - I converted it to an rtf then through Calibre into lrf and it works on the new Sony brilliantly!
I'm still confused as to why Calibre couldn't see the source file though - especially since it has no DRM. But then, I'm no techy, so probably wouldn't understand the explanation anyway!
Thanks .
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