We may have found other answers which could help you.
Click here for Replace Twyford Toilet
Twyfords close coupled toilet with plastic thing leaks between pan & thing?
removing lid of a twyford dual flush cistern?
How can I fit a new siphon unit in my twyford dual flush toilet?
Toilet not flushing properly-low pressure?
twyfords close coupled toilet 40 years old?
running cistern?