Sainsbury’s is the first major supermarket to drop this year’s Christmas advert starring an iconic children’s character. Shoppers have been quick to praise the new clip, describing it as “brilliant” and “amazing”. The advert features Roald Dahl’s beloved children’s character the BFG (Big Friendly Giant) and starts with him calling on Sainsbury’s to make this Christmas more “phizz-whizzing”. The children’s book character gathers Christmas staple foods from across the UK with the help of a Sainsbury’s colleague named ‘Sophie’ – a nod to the character in the book. The food is then transformed int…