Old light switch

[Mpen]

Ripping down my kitchen today and have come across an exposed box which wouldve been the old 2 way light switch before the extension was built, now I just one switch operating the kitchen light which is the other end of the kitchen. There are 3 cables in it.

I've attached a photo. I have lighting junction box in my loft so assume I may have one underneath first floor which I'm not too used to. I have two reds in a connector block which I think must be common and switch wire (coming from 2 separate cables), as when I disconnect this the light wont turn on. Then the black in the connector block being neutral. I then have a red and yellow in a connector block, one of these I assume would be the other switch wire for 2 way switch although I tried getting continuity earlier from other switch and I couldnt get? Also wondered if one of these were the other switch wire, would I just have an extra one as maybe just used the cable they had? I have tested for voltage and I get 12v between these two wires.

Then the red and black which are lying loose, they are from the same cable. Only thought I had was I had another light or switch once upon a time which is no longer there.

Understandably might be difficult to offer guidance without being here, but is there anything I'm missing? Cheers

 

[blup]

Where does the blue conductor go, or is it blue sleeved red and what you describe as one of the reds terminating in the block?

blup

 

[Mpen]

Yeah you're correct, the blue wire has the red sleeving over it and it goes into the connector block with the other red