Arena Flowers is the UKâs most ethical florist, sourcing flowers from ethical and Fairtrade-certified growers. Sovereign members can get 15% off hand-tied or letterbox bouquets and 20% off your first order via their app.* Log in to the secure customer area and head to Sovereign Perks â SHOPPING to find out more! ow.ly/NFV350GRFxM *T&Cs apply.