We may have found other answers which could help you.
Click here for Plastic 20 YearHow can I fit a new siphon unit in my twyford dual flush toilet?
Twyfords close coupled toilet with plastic thing leaks between pan & thing?
Broken Twyford Dual Flush Button?
how do i remove the lid of a twyford pure dual flush toilet cistern?
Toilet not flushing properly-low pressure?
twyfords toilet cistern?