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Probably accidently hit a key and looking to fix. Problem is file specific, other documents not affected.
After visiting Help in InDesign, I went to Preference, Guides and pasteboard; View and View, Extra specifically; tried Grid lines etc., but nothing I've selected affects changes.
Just to to check it's not this, try: View > Screen Mode > Normal / Preview (shortcut, with nothing selected press w – toggles bewteen Normal and Preview modes.
Thanks, Derek, that's done it. Just had to find a two places where I selected show grid lines to get rid of them and now I'm back to normal. What a relief.