Updated: We updated SR2009 No 4: combustion of biogas in engines at a sewage treatment works.
Standard rules and generic risk assessment for compression and spark ignition engines with an aggregated total rated thermal input of less than 5 megawatts to burn biogas produced from the digestion of sewage sludge at a sewage treatment works.
You can apply online for most standard rules environmental permits.
Follow this news feed: DEFRA