which ceiling wires go to my new light fixture?

[FrodoOne]

Bloomin MK, fancy calling the L terminals LINE. Nobody does that!

No doubt that is a joke !
In North America, the "Line" is often called "Hot" - a condition that no installed "Building Conductor" should ever suffer.

 

[gillinger]

Hello. Another newbie here. Over the past few days I've been on the same learning curve as the OP. I too had to remove a ceiling rose to fit a new flush mounted light fitting. I discovered that there were two cables coming in, IN and SWITCH wired to Line, Loop-in and Neutral. Luckily, I took a photo before removing it (below).
I finally found a couple of diagrams that made sense and worked out how to wire it. I've done it in exactly the same way shown in the bottom photo, using block connectors, except the earths are connected to the fitting.
For some reason, as soon as I restored power the light came on, even though the switch was off. Turning the switch to the ON position, the light stayed on. What have I done wrong, please?

 

[Taylortwocities]

@gillinger interesting. Not that anyone doubts your skills, but please post a photo of the actual wiring, rather than the diagram of what you think has taken place. Thanks.

 

[EFLImpudence]

Was the red tape there before?

 

[gillinger]

Yes, it was. I was baffled as to why it was there so I eemoved it. When I found out what was for I replaced it.
@Taylortwocities I'll do that tomorrow morning, when I can see what I'm doing!

 

[terryplumb]

You have either connected a permanent live to the lamp or the switch is knackered.
At any time did you blow a fuse or trip a circuit breaker ?
Have you done any work at the switch ?

 

[gillinger]

Yes, I've tripped a circuit breaker. I originally wired the two lives and the two neutrals to the lamp. I made the mistake of asking someone else if that was right but it turns out he didn't really know either. I haven't touched the switch

 

[terryplumb]

You have blown the switch when creating a dead short.

 

[gillinger]

Thanks. I'll take a look tomorrow. Is it a fuse I'll need or a replacement switch? I assume that's why it's permanently on.

 

[terryplumb]

A new switch, assuming the wiring at the new lamp is correct and neither of the two red wires are connected to it !!

 

[gillinger]

New switch, then

 

[gillinger]

Thanks to everyone who responded to my query. I just replaced the light switch and now everything works perfectly!
Cheers!

 

[SUNRAY]

Thanks to everyone who responded to my query. I just replaced the light switch and now everything works perfectly!
Cheers!

Thanks for coming back with the result

 

[colonyDIY]

Just a quick update - I connected the existing live and neutral wires and ran a new earth as suggested (the new bracket slid easily under the existing rose) and the new light works fine. thanks for your suggestions, very helpful