P217CEEFAX 217 Wed 19@Oct 12:07/42        The Court of Appeal has ruled that millions@of pounds needed for London's Royal Opera House modernisation can be legally raised by building@offices and shops in the Covent Garden Conservation Area.  Four thousand households in Hertfordshire were still without water this morning after traces of acid were found in the water supply.  A colleaion beteeen a lorra and a t traiSuwao simulateh at Llandudno Jgnction in north 'ales tada-, to te tie smergencr serv ces' reaction o a radioactive leak News index 1p2/2p2 Newsreel 119/219 In Brief NewsIndex Newsflash BBC2 TV