Renee Zellweger adopts a plausible English accent to play the title character of Helen Fielding's popular novel, a lovable nebbish who gets involved with her boss (Hugh Grant) at a London publishing house. As likable as Zellweger is, I could have done without all the pushy tactics of this 2001 romantic comedy, which guarantees at least one complete character reversal every half hour and a golden oldie blasting on the sound track every time your attention threatens to wander. It's so aggressive you don't even have to like it; the movie likes itself well enough for the both of you. Sharon Maguire directed a script by Fielding, Andrew Davies, and Richard Curtis. Colin Firth costars; with Gemma Jones and Jim Broadbent. R, 92 min.