The Marine Conservation Society and Readers Digest magazine, which set up a campaign called Beach Watch, says the hot summer brought thousands more tourists to the coasts - along with their litter.
Beach Watch 95 was the third annual clean-up and survey of beach litter. Almost twice as much rubbish was found than the previous year and three times more than in 1993.
The long hot summer meant beaches were packed and the report says most of the debris was dumped by tourists and local councils did not have sufficient money to clean up properly afterwards. Also a lot of rubbish was thrown overboard from ships.
The dirtiest beach was Jack Scout Cove, Silverdale in Lancashire. The cleanest was La Porte au Maillaird in the Channel Islands.