Internet ad spending grew tremendously in the U.K. last year, almost as much as the U.K.'s Advertising Association predicted, according to BrandRepublic. Growing 44.5 percent over 2003 billings, adspend for British online properties reached 597 million quid, approaching the point at which U.K. advertisers spend more online than they do on radio. The Advertising Association had previously predicted, back in July, billings growth of 53 percent. In Britain, online advertising accounts for 3.2 percent of billings, as compared with 3.3 percent for radio and 5.4 percent for outdoor placements.