Incredibly grateful for any help! The toilet is wall mounted, hidden screws, no easy release button, no grub for alan key. Not got a clue how to remove it. I've attached a picture if anyone has come across this type before? https://imgur.com/a/pLlcDVl
Normally on seats the round chrome shroud will lift up to reveal the top fixing screws. They can be quite awkward to remove sometimes, I use a small flat head to lever it off, or a pair of grips and grab it and pull up.
Thank you so much for replying! So I should be prying the chrome covers up while the whole toilet seat is attached?