Is the toilet flange screwed to the floor? If it is and it's just the toilet rocking on an unlevel floor, shimming(plastic) as Mike suggests should do the trick.Hi there, I installed a new WC on the weekend on a tiled / concrete floor. Now installed the WC still rocks a little. If I were to remove the pan etc, do I need to cement it in or can I use a circle of sealant to bed it on? Thanks for listening.