There is a slight sense of irony this year at the Walker Art Center's annual screening of the British Television Advertising Awards in that one of the most successful ads was done for the very non-commericial BBC. Awards co-ordinator Peter Bigg will introduce the show tonight (Wed) as it opens a run lasting through December 20th. He told Minnesota Public Radio's Euan Kerr the BBC ad attempted to persuade people to pay their annual license fees by showing the many different kinds of music available through BBC television and radio. The fee is close to 150 dollars, and must be paid by anyone who watches TV. The commercial also tried to raise millions for childrens charities.... British Television Advertising Awards Co-ordinator Peter Bigg will introduce the first screening of this years Awards a