Holly supported the development of a London-wide forum for professionals working in children and play. This is lead by the Alliance for Childhood and hosted by the GLA at City Hall in London. It had a wide ranging membership, from planners and policy makers to artists and engineers.
The forum covers a wide range of issues relevant to children living in London, and has focussed on planning and the London Plan. It meets regularly at City Hall to share new insights and initiatives regarding the quality of childhood.