I had mine fitted by the Red Cross and there was a bit of movement (more than I would have expected), when I asked the fitter about it he educated me that you do need to have a bit of movement in it so that in an accident it will absord the impact better. If it doesn't move at all it can increase injury ..... Food for thought!
I found when i had my seat installed in the middle seat,it moved from side to side quite a bit because the middle seat was raised up and so the child seat would slide. I recently had to move it to the seat by the door and while it still moves a bit, it is nowhere near as much.
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