NEW YORK — Encore Media Group is teaming with Overseas Filmgroup to co-produce the theatrical film “Relative Values,” which stars Julie Andrews, Sophie Thompson and Jeanne Tripplehorn.The film, based on the 1951 Noel Coward play, will have its pay cable premiere on Encore’s Starz! service after it plays in theaters. “Values” is the sophomore effort of Eric Styles, whose debut pic “Dreaming of Joseph Lees” is slated for a late-fall release by Fox Searchlight. Pic also stars Colin Firth, Stephen Fry, William Baldwin and Edward Atterton. The production began principal photography earlier this month in the U.K. and will wrap next month.