From 1 April 2009, gypsum and plasterboard cannot be sent to landfill mixed with biodegradable waste. The following link gives details of the new regulations from 1st April this year.
Please be aware that there are companies in Knowsley that can deal with gypsum and plasterboard waste. See the new version of the Recyclers Database below for further information to find companies who can help you dispose of your waste.