BT's LICENCE to print money, Yellow Pages, is in the unaccustomed mode of handing some of it back - in the form of free Web pages on its award-winning Yell site (yell.co.uk). The deal, which is open to over a million UK-based companies, offers a one-page entry on the Yell site free for at least a year from October 1997. [No reason for this largesse is apparent but sprats and mackerels are swimming around there somewhere.]