We have two bathrooms with Ideal Standard toilet seats. One you can remove the seat by simply undoing hexagon socket bolts with a small hex key. The other seat has no visible bolts and I've no ideal how to remove it. Even Ideal Standard couldn't help. They said simply to pull the seat upwards but even a strong tugging on it doesn't work. I've attached a video and hopefully someone can help. On the underneath of the toilet I can feel two holes either side with a rod coming through it from what I presume is the seat. But not nut I can feel to loosen it.
Video here:
Photo of the underside here:
Video here:
Photo of the underside here:

