Ex-employees and industry experts reveal the tricks of the trade used by both retailers to draw in customers at Christmas time, from Harrods' opulent window displays to Aldi's cheeky 2022 advert. Foodie friends blind taste test some of Aldi's and Harrods' biggest sellers this Christmas - with surprising results. From panettone to Christmas crackers and champagne, which retailer comes out on top in terms of taste and quality?