1. Have a look at https://www.bristan.com/products/mixer-showers?code=n2 cshxtvo c#Spares - gives an exploded view.
2. The temperature control knob should just pull off.
3. Parts 2, 3, 4 and 5 should just pull off / out. However, in my experience, they tend to be wedged in with limescale. I usually resort to an improvised puller with a screw into the thread which holds handle on.
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