The London Plan download section
Housing
3A.3 Maximising the potential of sites
The Mayor will, and boroughs should, ensure that development proposals achieve the maximum intensity of use compatible with local context, the design principles in Policy 4B.1 and with public transport capacity. Boroughs should develop residential density policies in their DPDs in line with this policy and adopt the residential density ranges set out in Table 3A.2 and which are compatible with sustainable residential quality.
The Mayor will refuse permission for strategic referrals that, taking into account context and potential transport capacity, under-use the potential of the site.