The Royal Commission on Environmental Pollution

Sunlight is in such short supply in the urban environment that anyone proposing a high-rise development should be obliged to produce solstitial and equinoctial shadow plans, showing the duration and extent of any overshading. The impact on the health and quality of life of people living and working in the wake of any shadows cast could then be assessed. That this is not carried out as a matter of course when tall buildings are planned is symptomatic of the low priority attached to health in modern urban developments. Also any building, be it tall or otherwise, should allow its occupants access to direct sunlight. The indoor environment ought to be designed to meet the minimum requirements of the British Standard on lighting for buildings, BS8206-2. The fact that interiors are not shows how little consideration is now given to the ill-effects of sunlight deprivation.

Anyone who wishes to investigate this further might be interested in the Royal Commission on Environmental Pollution's Report on the Urban Environment, which was published on the 6th March. According to Sir John Lawton, who chaired the Commission:

“Commissioners are astonished that, on the eve of the new phase of urban regeneration and expansion, we lack an over-arching urban environment policy to coordinate the provision of housing, transport, energy and other vital services. Tinkering with any one of these issues in isolation is bound to fail. We can and must do better if we are to meet environmental challenges and improve the health and wellbeing of our citizens.”

Amongst other things the report provides confirmation, if any were needed, that health and wellbeing has little influence in modern urban design and planning. Sunlight is not mentioned in the report at all. Not once in 232 pages. In common with The Code for Sustainable Homes and Guidance for Tall Buildings the report makes no allowance for the favourable influence of the sun on biological rhythms, depression, immune function, or anything else.
http://www.rcep.org.uk/