Do I need a new toilet syphon?

Do I need a new toilet syphon? full size image
Hi all,
My toilet keeps running after flush has completed and Im finding online advice for a toilet with a syphon is scarce. I can't see any immediate problem when I look inside and have tried fiddling with the water pressure and adjusting the level.
Can anyone help? Do I need a new syphon?
I recently had a new boiler which involved removing the old water tank - I don't know if this has effected anything.
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