The Waste (England and Wales) Regulations 2011 require you to provide the Standard Industry Classification (SIC) code applicable to your business/organisation.
Don't know it? You can find out your SIC code by using the Companies House SIC lookup.(opens in a new window)
You will need to try keywords to find the correct matching code (e.g. Restaurant would return codes for licensed, unlicensed, burger bar etc).
N.B. If you are a charity please use SIC Code 88990. If you are a charity shop please use the SIC Code relating to the type of retail business you operate.