 Experimental transmissions of the DAB Eureka 147 standard from the Crystal Palace transmitting station by the BBC started in 1990 with permanent transmissions covering London in September 1995 . With the expansion of its single @-@ frequency network in the spring of 1998 , the BBC national ensemble was available to 65 % of the UK population by 2001 and to 85 % by 2004 . 
