How to remove this bath drain?

[Njlockett]

It’s an old bath and not sure what tool I need to remove the drain which is leaking? Any suggestions please?

 

[HERTS P&D]

5 pence in a pair of grips.

Andy

 

[CBW]

Or perhaps an old flat wood chisel

 

[HERTS P&D]

Or perhaps an old flat wood chisel

More likely to have a 5 pence.

Andy