*When you buy a house, you buy fixture and fittings.
This means anything secured to the building. IE shelving, bookcases (obvs if screwed to the wall), TV mount (no one expects you to leave the TV)
Fittings refers mainly to units, the bathroom etc, wardrobes (if fitted) these types of.items.
If someone has already signed or an agreement to purchase has been made, then you need to contact the buyer and ask them.
It should have been noted before time, but that's life.
If.you have the buyers contact info, or their solicitor, speak to them. You should then, HUMBLY ASK.... do you mind if we take with us the 2 shelves in the kitchen. We didn't realise that OFFICIALLY they're a fixture n fitting, but would love to take them with us. Well replace with 2 other shelves.
Then hope they hadn't noticed they were anything special, and say, don't worry.
To just remove, is not only wrong, but could be illegal.*
This is not right. You don't have to leave anything but if you list it in the details that implies you are leaving it and if you get to the fixtures and fittings list and don't put it on the list the buyer may be miffed and may pull out.