2 light switch problem

[Junior]

I have 2 switches for my lounge light, both have to be on for it to work, switch 2 must be on for switch 1 to turn the light on and off.

I know it's one cable in one wrong hole, but which one? The house came like this, I'm not guilty for this little faux pas.

Thanks for any replies.

 

[breezer]

the first switch is supplying the 2nd.

list what you see and we can take it from there

 

[plugwash]

afaict there are two main possibilities

1: a wire is loose/in the wrong hole but all the right cable is in place
2: the spark who installed it didn't even install the correct cable.

as mentioned we need info on what wires are where before we can give you more info.