Light pollution was introduced within the Clean Neighbourhoods and Environment Act (2005) as a form of statutory nuisance under the Environmental Protection Act (1990). Since the introduction of the act, lighting impact assessments are becoming more commonly requested for planning applications. Although light was described within the act as having the potential to cause statutory nuisance, no prescriptive limits or rules were set for assessment. Guidance Note 01/20: Guidance notes for the reduction of obtrusive light produced by the Institute of Lighting Professionals (ILP) however is commonly adopted in the UK as a source of suitable lighting assessment criteria.