Oh my goodness guys thankful all for the helpful replies!!! May I start by saying I never shout at her, I do not believe in shouting at animals. She is a VERY pampered kitty. She is indoor mainly but of a morning, I'll open the kitchen window for her and she will go into the back garden (never leaves the garden) and will run inside if shouted but is mostly back inside of her own accord. Now in my little house there is me, my partner and her. She is completely obsessed with me, following me literally everywhere I go and as soon as I sit down she is straight onto my shelf of a chest to sleep. Even if I am in the bath, she has to climb in with me and lay on my non wet chest/stomach.
She walks around in a sort of trot, skipping as she walks fast (I can't really explain it) and her tail is straight up and high.
Her litterboxes haven't changed since I got her. She hasn't really grown much since she was 9 weeks old so her litterboxes are plenty big for her, she can get inside them, walk a step, turn around etc. But when she "goes" she always holds onto the litterboxes edge with her front paws and have her rear end in the litterbox doing her business. Her boxes are in the kitchen (under countertop against a wall). She uses this most, in the living room (under a table against a wall), and one in the bathroom quite open. None of them are covered boxes, just tray types and are cleaned twice a day. I've actually forgotten when she started peeing on the couch, it was definitely a few months ago though.
Thank you for the info on the cleaner!!! I'll look into this right now!
Oh and just to clarify, I use pet safe zoflora and always keep out of reach until fully dried
Thanks again guys!!!