Problem with light switches not working properly

[muffking]

Both switches will currently be wired in parallel, so it would just be a case of checking that the stairs switch has 2 twin & earths and joining them together so the connection from the room switch is continuous all the way to the light. i.e. brown to brown, blue to blue and earth to earth, assuming it's not the old colours, in which case I'm sure you get the idea.

 

[SUNRAY]

Both switches will currently be wired in parallel, so it would just be a case of checking that the stairs switch has 2 twin & earths and joining them together so the connection from the room switch is continuous all the way to the light. i.e. brown to brown, blue to blue and earth to earth, assuming it's not the old colours, in which case I'm sure you get the idea.

I reckon they're wired is series and my suggestion would be to connect the 2 wires together in a connector. However I'll put that advice to one side until we have pics.

 

[securespark]

I can take photos but both switches just have two wires, one for the common and one for the L terminal. The light fitting also only has two cables. Should there me more?

You say both switches have two wires. So each switch only has a red and black (or brown and blue)? Is there no earth wire?

You say the light fitting has two cables. Two cables or two wires? Again, are there no earth wires?