As you may know, dogs are allowed on the beach every day in the summer, before 8am and after 7pm. So owners need to clean up after their dogs and not think burying it is ok. The same goes for humans, burying a nappy in two inches of sand is not going to decompose, nor is a late night drinking session going to make the bottles wash away and end up on a foregn shore. Put them in the bin.
If you see this behaivour this year, say something, I will and do. I want the beach to be clean every day when I am on it. I carry spare scoop bags when out with my dog and offer them if I spot someone about to walk off leaving the evidence for all to walk in.

By the way, if you get up early you may see Syd, the huge deerhound on Porthmeor beach, they don't come much bigger!!