Light switch reversed after transformer blew in the ceiling

on the transformer picture, on the left ( first lot of screws) is the wiring from the light itself, blue on the left brown on the right. The second lot of screws is the wire from the transformer to the wires in the ceiling, again blue on the left brown on the right
 
I am telling you everything why wouldnt I if I was asking for help.. whats an Op as you keep referring to me lol
No-one is getting at you, or accusing you of deliberately withholding any information. It's just that the situation seems pretty odd and some of us feel that there must be something 'we don't know' which is making it difficult for us to make sense of it.

"OP" is simply 'original poster' - nothing rude!

Your pics don't really help me much, but maybe someone else will see something relevant there.

Kind Regards, John
 
I am telling you everything why wouldnt I if I was asking for help.. whats an Op as you keep referring to me lol
Clear photograph of the rear of the offending switch - showing the conductors and the terminals would help - it might go someway to allay the suspicions.
 
On the first photo the closest switch the first lot of wires is to the living room .... and the far side is to the landing
 
Looking at the first picture of the downstairs switch - move the two reds from their current terminal (L2?) to the L1 terminal.
 
Looking at the first picture of the downstairs switch - move the two reds from their current terminal (L2?) to the L1 terminal.
Assuming that other terminal is there (I can't really see for sure), one assumes that such a move of the two reds would almost certainly 'cure' the problem that the OP reported. However, given that we are assured that there have been no changes at the switch, I would personally be very uncomfortable (to say the least) about using that as a 'solution', since it would leave totally unanswered the question of what on earth had happened (and presumably was still 'happening') to bring about the change reported by the OP, wouldn't you?

Kind Regards, John
 
I personally would safely remove the switchline from the switch first.
If the light still stays on then theres obviously something more serious going on.
 
Sir Arthur Conan Doyle said:
How often have I said to you that when you have eliminated the impossible, whatever remains, however improbable, must be the truth?
We have been scratching our heads for days now, trying to come up with a logical electrical explanation for the switch problem. We have not found one.

It is in my opinion, and this is not a dig at the OP, that the switch has always been wired that way, and that its location next to a two-way switch, which may too normally operate in reverse, has caused it to never be noticed until the testing of such arrangement, following replacement of the transformer, resulted in a bit of thinking and realisation that something wasn't 'quite right'.
 

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