I've just read the other thread about trying to paint over shiny walls. (Commiserations).
It's this stuff
dulux.trade-decorating.co.uk/products/info/dulux_trade_diamond_matt.jsp
and the decorators are about to start
A tough, washable matt emulsion that delivers excellent durability. It is resistant to many common stains and will clean without polishing up. With its new improved formulation, Diamond Matt delivers even greater durability and stain resistance, keeping that just painted look for longer.