The last of this week's four specials for Children in Need comes from an auction house in Folkestone. Armed with £500 and the expert knowledge of Philip Serrell and James Braxton, newscaster Dermot Murnaghan and Grandstand's Steve Rider sift through boot-sale bric-a-brac in search of handsome items with which to make a profit at auction. Host David Dickinson announces the winners during tomorrow's extravaganza after 8.30pm. (W)