Principles and Practice | Vodafone Group Plc Sustainable Business Report http://www.vodafone.com/content/index/about/conduct.html http://www.vodafone.com/content/index/about/conduct.html http://www.iccwbo.org/advocacy-codes-and-rules/areas-of-work/corporate-responsibility-and-anti-corruption/ http://www.iccwbo.org/advocacy-codes-and-rules/areas-of-work/corporate-responsibility-and-anti-corruption/ http://www.transparency.org.uk/our-work/business-integrity/business-integrity-forum/ http://www.transparency.org.uk/our-work/business-integrity/business-integrity-forum/ http://www.ibe.org.uk http://www.tomorrowscompany.com/governance/ In Ghanaian culture it is common to provide a small amount of cash as a tip or gift for good service in a number of environments beyond a restaurant (where tipping is commonplace globally), including in the retail stores operated by Vodafone.