The consumer PR agency, set up in 2009 by former Shine Communications creative director Rana Reeves, also walked away with the boutique and specialist consultancy of the year gongs and not-for-profit campaign of the year.
The event – the PR industry's 'Oscars' – took place at Grosvenor House on London's Park Lane, hosted by former No.10 comms director Alastair Campbell.
More than 1,200 senior industry professionals turned out to see Blackpool FC manager Ian Holloway collect his trophy for Communicator of the Year, while Clarence House comms secretary Paddy Harverson accepted his accolade – PR Professional of the Year.
Kaper was awarded New Consultancy of the Year, Ketchum won International Consultancy of the Year and Private Sector Department of the Year went to EDF Energy.
Campaign of the Year went to Clarion Communications and Lakeside Shopping Centre for the Lakeside's Living Christmas Fairy campaign.
For a full list of winners, see below.
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Pictures from the night will be available shortly.
PRWeek Awards 2011 Winners
Consultancy of the Year: John Doe
Campaign of the Year: Lakeside's Living Christmas Fairy, Lakeside Shopping Centre with Clarion Communications
International Consultancy of the Year: Ketchum Pleon UK
Large Consultancy of the Year: Edelman
Mid-sized Consultancy of the Year: Brands2Life
Boutique Consultancy of the Year: John Doe
PR Professional of the Year: Paddy Harverson, comms secretary, Clarence House
Private Sector Department of the Year: EDF Energy
Non-Profit Department of the Year: Samaritans
People & Agencies
Communicator of the Year: Ian Holloway, manager, Blackpool Football Club
New Consultancy of the Year: Kaper
Specialist Consultancy of the Year: John Doe
Young PR Professional of the Year: Victoria Blakeley, Weber Shandwick
Corporate & Public
Public Sector: Barclays Cycle Hire Scheme, Transport for London
Not-for-Profit: Ctrl.Alt.Shift Presents Dear Diary, Christian Aid with John Doe
Internal Communications: Legal Services Provider to the London 2012 Olympic and Paralympic Games, Freshfields Bruckhaus Deringer
City and Corporate Communications: Kazakh Banking: It's Not Funny Money, JSC BTA Bank with Ogilvy Public Relations Worldwide
Product & Promotion
Global PR: Yota Space, Yota with W Communications
Financial Services: Making 'Contactless' Streetwise with the World's First Cashless Busker, Barclaycard and Barclays with The Red Consultancy
Marcoms: Consumer (annual fees less then £100k): Selling the Sound of Silence, The Royal British Legion with Burson-Marsteller
Marcoms: Business: Solar: A Renewable Power That's FIT for Purpose, Sharp Solar with Brands2Life
Marcoms: Consumer (annual fees more than £100k): Think You Know QVC? Think Again, QVC with Mischief PR
Technology: Digitising the Bletchley Park Archives, Hewlett-Packard Imaging and Printing Solutions with Edelman
Healthcare, Ethical & OTC Consumer: Shedding the Pounds, Allergan with Ketchum Pleon UK and the Royal College of Surgeons
Specialist & Technique
Research: National Shed of the Year, AkzoNobel (Cuprinol) with Grayling
Issues and Crisis Management: Illuminating Blackpool Rock: Looking for Shale Gas in the Bowland Basin, Cuadrilla Resources with PPS Group
Public Affairs: No Second Runway at Stansted Airport, Stop Stansted Expansion
Digital and Social Media: 1940 Chronicle, RAF Benevolent Fund
Broadcast: WWE World Tour, World Wrestling Entertainment with Shine Communications
Live PR Event: Lakeside's Living Christmas Fairy, Lakeside Shopping Centre with Clarion Communications
Special Environmental Award: I Love Natural Cork, The Portuguese Cork Association with Grayling
The Awards 2011 book will be available in this week's issue of PRWeek