Wooden Chair Needs TLC (PL4)

I've got a wooden chair which has things that need looking at before it can used.
The front legs have a wobble which I don't know how to fix, there are some screws which I've tightened but this hasn't helped.
I don't know if there is something else that could be done to fix this issue.
There are some points of damage on the wood and there are some marks on the seat cover (see photos).

Collection from PL4 Greenbank.