'It was an example of a highly effective, integrated and creative team that developed and maintained a high national profile over a relatively short space of time,' the judges said.
Upward Curve PR accepted the award for Best Freelance or Agency Team, following its work with Southall Black Sisters and St John Ambulance.
The Best Big Bucks Campaign went to Mencap for its 'Snap Photo' competition, which showcased pictures of people with learning disabilities at the Victoria & Albert Museum.
Farm Africa won the Romeike International PR on a Shoestring Award for its campaign timed to coincide with Make Poverty History.
The fifth and final accolade, the Advocacy Online Best Campaign Award, went to the National Children's Home for its mobile phone and online campaign to highlight child bullying.
The ceremony took place on 20 February.