The nature of your comments must be relevant both to planning and to the application in question.
Only material planning considerations can be taken into account for the purpose of determining a planning application.
Examples include:
• the relationship to local, regional and national planning policies
• traffic impact and highway safety
• privacy, visual impact, overshadowing and overlooking
• noise and disturbance
• impact on the character of the surrounding area
• effects on trees and on the natural environment.

Non-planning issues should not be raised.
Examples include:
• personal morals or views about the applicant
• possible effects on property values
• issues relating to ownership, land encroachment, boundaries, fence lines and party walls
• restrictive covenants
• property maintenance
• loss of private views
• business competition
• conflict with other laws.