Maybe lidl's version!I use what most of my Spanish friends use. Coca-Cola works for me .
Perhaps we care enough about the environment not to use chemicals. There are many rural areas where cassette dumps are on septic tank systems. Blue is bad for them.My pet hate is being downwind from those stingy people who wont spend the few Bob it costs to treat the toilet with the right stuff. Have they no sense of smell??? A big bottle of blue costs about £12 and lasts a season. Who cant afford that???