Supply Chain Standards Simply click the supply chain or multiple supply chains you are interested in, then click on the search button below to view the relevant standards and other useful documentation related to each sector. Red Tractor Assurance and the AHDB are looking to revise the current Safe Haven standards. A questionnaire, which can be accessed via the link below, has been created to obtain member and industry feedback on the current standards and future direction. Red Tractor and the AHDB would be grateful for any feedback before the questionnaire closes on 1st March 2019. Click here to complete the questionnaire.