It is considered that the threshold of 40% of new homes to be affordable on sites of 10 or more dwellings does accord with advice contained within NPPF. There will be circumstances however where not all sites will be able to meet these requirements for example some brownfield sites that have complex contamination issues may make affordable housing at this level unviable. It is considered that the strategy of the plan is focussed towards development within Cambridge city and on the edge of Cambridge where affordable housing provision may be less viable. The plan should recognise this and look to release more greenfield sites that have a good prospect of meeting the proposed affordable housing requirements.