We've bought two in the last few months and can't seem to find one which doesn't slip to the side. DH has looked up toilet-seat-fitting hacks online and tried them all but the fixings still slip and allow the whole seat to slide to the side. I suppose we have bought relatively cheap so far so maybe we need something 'higher end' in order to ensure sturdiness? Has anyone bought one recently that doesn't slide, I just want to have a wee without worrying I'm going to slip off 