The two Western countries had exported 83 shipping containers filled with plastic waste to the port of Sihanoukville.
The material developed in York will be used for the YES! range of snack bars.
Disposable plastic cutlery, plates and bowls, straws and PVC packaging are among the eight items that should be eliminated, Wrap said.
The Which? research looked into the wrapping used on 46 of the most popular items sold by 11 supermarket chains.
The amount of plastic was the most marine biologists had ever seen.
ITV News gains rare access to the unseen side of the Galápagos Islands and discovers the depressing reality arriving on every ebbing tide.
The move aims to boost recycling rates and cut litter, and comes amid increasing concern over the issue of single use plastic waste.