[derekgas]

To answer your question emzy, the 2 buttons are as described by mummiboo, one is a half flush and one a full flush, the chrome coloured ring around them will unscrew and allow the lid to be lifted, it is this ring that is attached to the syphon so that it holds the buttons in place and prevents the lids from coming off, if the buttons are sticking, they are not aligned properly, have the council send the plumber back to sort it out. If it is a single button by the way, press and let go for short flush, press and hold for full flush.