Toilet needs to be screwed into concrete floor

Posted 23rd May 2017
The floor of my toilet is concrete so the previous owners somehow managed to install a toilet without screwing it down to the floor but it did not move, so I can only assume that he used something like no more nails or super glue (Lol). He had tiled the toilet floor completely then placed the toilet pan on top of the tiled floor!

The toilet bowl has moved now so really it needs to be screwed down properly. Is it possible to do this without dismantling the toilet bowl or will the whole toilet needs to be dismantled to allow the drilling of the screw holes and then the screws to be applied?
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