Luxury haircare and beauty brand by Negin Mirsalehi, Gisou, is celebrating Spring with a honey-themed pop-up inside the luxury department store Harrods. At the pop-up visitors can explore the brand’s famous honey-infused product range and the new launches, such as the new Honey Gloss Ceramide Therapy Hair Mask, 15ml Hair Perfume minis and the new sun-kissed shades of the Honey Infused Lip Oils: Raspberry Swirl, Bee-llini Peach and Glazed Plum. Guests can…