While you wait for answers, we may have found some information which could help you.
Click here for Button Toilet Cistern WaterIdeal Standard Flush leakage?
How can I stop water constantly running into bowl?
How to adjust the pressure needed on the duel flush push buttons?
How to repair Ideal Standard Flush Valve?
How can I stop dual flush toilet from running?
can i fix a different toilet seat on a ideal standard wc?