Could someone advise if the ceramic cartridge in the image of a tap attached just pulls out of the housing, or is the housing removed in some way? Both appear to be immovable at the moment.
The shroud unscrews. You can try by hand using rubber gloves to give extra friction.
It can help sometimes to pour boiling water over the shroud first to expand the metal.
If all else fails, I wrap a good few turns of insulating tape around it to protect the chrome then use pump pliers.
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