C4 was originally called the "Cat Care and Control Consortium" and was set up in 1999 by four charities - RSPCA Central London, SNIP, Cats Protection and Animal Aid & Advice , who came together in order to use economies of scale  in tackling cat overpopulation. The first three continue to support the scheme along with the national RSPCA and several of its separately funded local branches

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We remain grateful to all of those former funders who have joined us at different points along our journey to help make our work sustainable and effective. These include:

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• Animal Aid & Advice London

• ARCH

• Cat Action Trust 1977

• The Mayhew 

• Petplan Charitable Trust

• Wood Green​

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The RSPCA's London Region Branches support us collectively through funding as a region;

The following current local Branches, either in current form or as precursor branches who merged, have funded us further during our history in addition to pooled funding.

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• RSPCA Bromley & District

• RSPCA Central London

• RSPCA Essex SW

• RSPCA Finchley, Golders Green & District

• RSPCA Herts East

• RSPCA Guildford & Epsom

• RSPCA London East & Havering

• RSPCA London South East

• RSPCA Middlesex NW & South Hertfordshire

• RSPCA South London

• RSPCA Wimbledon, Wandsworth and Sutton (SW London)

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Thank you to you all, very much.