I’ve done that now the switch for the light in the kitchen works but still dim and the front room light not workingRemove the black wire from between the reds and report back any effect.

That is the way it sometimes is Harry, sometimes for good reason and sometimes (more often) not but it makes it "fun" , yep lighting circuits switching can be a bit complex sometimes and not always easy to follow, sometimes there are a few different alternatives to produce similar results too and someone who follows some methods sometimes find i a bit difficult to follow other methods which are equally as valid. Same as with IT , get a group of us on a keyboard on a laptop etc and you might find we all do six different ways to get to the same thing but are all equally correct and useful but we might find the other 5 ways annoying and difficult to follow even though others find the opposite.An obvious thing to try, would be to swap over those two blacks, which are brown sleeved, but I'm at a loss, to understand why there might be two, which are brown sleeved at all...

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