You can read the planning application on Lewisham's planning website.
The Forest Hill Society has written to object to this development:
"We believe that dividing the ground floor retail unit to provide access to the upper floors is detrimental to the retail unit because of the reduction of its size and the poor design quality of the frontage. This will affect the future viability of the retail unit at a time when Dartmouth Road is at last coming back to life as a retail area, with promised street development and many small businesses starting up. We do not want to see any of the retail units suffering a reduction in their viability."
Full letter of objection can be read here.