Stop creaking stairs 1930s house

[Smk80]

Hi all

Looking for advice how to fix/stop creaking stairs. We live in a 1930s house so the stairs are pretty robust but gradually over the past few years the creaking has become worse. I've looked under the stairs and the previous owner had already put in some wedges so not sure what the next possible fix might be?

Thanks

 

[blup]

Check the condition of the w. Glue and screw wood blocks to underside of treads/risers where they meet.

Blup

 

[Smk80]

Check the condition of the w. Glue and screw wood blocks to underside of treads/risers where they meet.

Blup

That has already been done by the previous owner, and the blocks still look pretty stable and stuck

 

[blup]

That has already been done by the previous owner, and the blocks still look pretty stable and stuck

I would get someone heavy to walk up and down the stairs while you check underneath fir movement.

Blup