Incredible that the provision of 24 units for social housing has been reduced to bunging the council £200,000 for the promotion or provision of affordable housing.
It is interesting that the applicant was able to write off some of the costs of the appeal against social housing provision to ensure they can make 17% profit.

I have a big problem with these tests of 'economically viability' as it means that housing that is designed to be very expensive (e.g. underground car parking with a number of sets of electric gates) and employs the most expensive barristers in the country, can make it economically unviable to include significant social housing. This is a threat to policies from national, regional, and local government that set quotas for social housing.

If you want to look at the details of the decision and the link above doesn't work for you, search for DC/15/91696 on http://planning.lewisham.gov.uk/online-applications/