There are currently three 24 hour off licences in the London Borough of Barking and Dagenham:
Asda, Merrielands Crescent, Dagenham, Essex, RM9 6SJ - 020 8984 7633
Tesco, Highbridge Road, Barking, Essex, IG11 7BS - 020 8219 7600
Crooked Billet, 113 River Road, Creekmouth, Barking, Essex, IG11 0EG - 020 8507 0126 (Pub)
Please Note: Just because a shop is listed as having a 24 hour alcohol licence doesn't necessarily mean that the shop is open 24 hours a day, 7 days a week. It's also worth noting that large 24 hour supermarkets (Asda, Sainsbury's and Tesco) are not open all night on Saturday, Sunday and bank holidays (due to Sunday trading laws in England and Wales).