Thought i might add this. Maplin no longer makes these but this guy is selling PCBs of the clone, so i bought one.
http://www.ebay.co.uk/itm/222442029161?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AITBuild doc, Schematic and sound clips are there also. Looks cool, can't wait to build it when all the parts arrive.
"Red velvet lines the black box"