the regional sites and monuments records. It expanded rapidly with significant donations from many public and private sources supplementing the detailed survey and photographic records of the Commission itself. Transfers from many other public organisations, including Cadw on behalf of the Welsh Assembly Government, take place from time to time. Important collections have been accepted from the private and commercial sectors, one of the most notable being the acquisition in 2008 of the Aerofilms collection of historic oblique air photographs. Today, the photographs in the National Monuments Record are Wales's largest national collection, with about 1.5 million images. A foretaste of the future was the Commission's participation in the Gathering the Jewels project, which provided an opportunity to make available online many notable images from the National Monuments Record and began a digitisation programme which remains one of the Commission's priorities in its service to the public. SWISH Partnership In order to provide public access to its archives and collections, the RCAHMW entered into a partnership with its Scottish counterpart. This partnership was known as SWISH (Shared Web Information Services for Heritage) and was designed to develop online public services. This collaboration was the first such project between the two devolved administrations that had recently come into being. SWISH supported Coflein, the Commission's internet portal: this carries details of some 80,000 sites and monuments in Wales. Much of the information on Coflein is derived from the Historic Environment Records of the Welsh Archaeological Trusts; information also comes from the National Monuments Record archive catalogue. In 2006 SWISH began developing the Historic Wales Portal, which offers access to the historic environment records of a wide range of bodies, including the National Museum, Cadw, and the four Welsh Archaeological Trusts. The SWISH partnership enabled access to the National Monuments Record using map searching online. It ended in 2019, and the Royal Commission has begun to develop its own system to replace it - although not in partnership with the other heritage organisations in Wales. Hidden Histories A five-episode BBC television series following the field investigations of the Commission, Hidden Histories, was broadcast in 2008 on BBC2 Wales and in 2009 on BBC4. A second series was in production in summer 2009. Both series were made by Element Productions Ltd and presented by Huw Edwards. Proposed merger In May 2012, the Welsh Government announced that it wished "to create a process whereby the