The AAP must explicitly specify that a measurable net gain in biodiversity will be achieved, and we suggest that a minimum percentage of 20% is included (using a recognised biodiversity accounting methodology).

The AAP will result in the final loss and destruction of the Chesterton sidings site, which was until very recently a high quality brownfield site supporting priority habitats and many priority species. In calculating the measurable net gain to be achieved, the precautionary principle should be used, with Chesterton Sidings scored as priority habitat, in calculating the net gain and offsetting requirements.

In order to achieve a net gain in biodiversity, significant off-site compensation is likely to be required. A decision needs to be taken now as to whether this will all be off-site at strategic locations such as Wicken Fen, or whether part of all will be achieved closer to the site, for example along the river corrdior. If the river corridor was included in the AAP boundary, then this would become on-site. Use of the river corridor would also increase the options to meet green space requirements for the new residents.

The use of urban wildlife features such as green roofs, green walls, planting schemes and building design that makes spaces for wildlife should form part of the solution to achieving a net gain in biodiversity, but will be additional to the habitat offsetting requirement.