A researcher with the Britannia trust has contacted the PPHP looking for copyright holders to a number of images they hold. The PPHP has put the researcher in touch (as below) with the Hulton Archive at Getty Images the Press Association for their owned collections but there are still a few outstanding as below:
Sport and General Press Agency Ltd – now at PA Images
Central Press Photos Ltd – Getty Images
Fox Photos Ltd – Getty Images
Detroit Photographic Co.
Topical Press – Getty Images
Photographer: Turner ..awaiting more info on this
Photographer: Murdoch ..awaiting more info on this
Details details on our Press Photo History site now.