There is anecdotal evidence that what is finally delivered on the ground through s106 may be different from what was originally negotiated – for example, a large site may be broken up and sold to different developers who may re-negotiate the S106 affordable housing provision. The project aimed to assess whether affordable housing is being lost or modified through negotiated changes to the initial agreed S106 as well as through non take-up of planning permission; and to gain an understanding of why this is happening and of patterns of behaviour. The project was undertaken jointly with the University of Sheffield.