Hi @sparkyweaselActivated carbon will remove chlorine, but not chloramine or metals. It's also good for organic compounds, but those are unlikely to be a problem in UK tapwater.
Catalytic carbon will remove chloramine as well as chlorine.
A good tapwater conditioner will remove or neutralise chlorine, chloramine, heavy metals, ammonia and nitrite.
Your water supplier may not routinely use chloramine, but they may use it occasionally to treat a particular problem or risk, so it's good to be protected against chloramine.
Excellent summary!
Just add dihydrogen monoxide and away you go.....
JPC