Britain's biggest nightclub operator vowed to tackle the issue of drink-related violence yesterday by introducing plastic glasses throughout its venues over the next 12 months. The decision by Luminar, which runs about 120 of the UK's biggest dancing venues, including the Liquid and Oceana chains, comes as the rest of the pub industry is stepping up attempts to stop police introducing glass bans. The trade paper The Morning Advertiser has this week called on MPs to sign an early day motion opposing moves by police forces across the country to force pubs and clubs to replace glasses with polycarbonate containers. The MP John Grogan, chairman of the All-Party Parliamentary Beer Group, said: "We are calling for a sensible approach rather than a blanket ban. Banning glass is the wrong way to attract a wide and diverse set of customers."