Here are some useful links to the different planning departments we have worked with in the past along with few other links:
Epsom council Planning Department
http://www.epsom-ewell.gov.uk/EEBC/Planning/default.htm
Kingston Upon Thames council planning
http://www.kingston.gov.uk/info/200154/planning_and_building_control
Sutton council planning department
https://www.sutton.gov.uk/info/200154/planning_and_building_control
Hounslow Council planning department
http://planning.hounslow.gov.uk/Planning_Index.aspx
Planning Portal
http://www.planningportal.gov.uk/permission/
Party wall
https://www.gov.uk/party-wall-etc-act-1996-guidance