Jammed expansion bottle lid

[Coaster]

Hi all,
Fiesta zetec s expansion bottle lid came apart, leaving the inner part jammed tight in the opening.
I have tried leavering it out with a screwdriver and also pliers but can't get enough grip.
Before I damage the bottle, is there any tips for loosening the thing off?
I was thinking possibly pouring hot water on it. Currently the coolant level is right on the main mark so no immediate need to get the bigger off. Any suggestions?
Thanks

 

[Nozzle]

Get a broad screwdriver and use that as a "drift" to tap it around in the opening direction.

Nozzle

 

[Burnerman]

I was able to release one using slip joint pliers...that was on a C Max though.
Give us a picture if you can.
John

 

[Mottie]

Drill a hole in it, screw a self tapping screw into it and use a couple of flat bladed screwdrivers to lever it out.

 

[Old Salt]

Take it for a run to get it hot, then try one of the above. A secondhand bottle is about £35 off flea bay so not the end of the world and probably easier in the long run if the inner is stuck.