This is quite interesting. Normally, collusion is fixing prices at too high. The 'Stupidity Defence' always works here. Now they are charged with being too slow and stupid to put in extra diesel cleaners. Probably because that added extra carbon dioxide. It's like a vast ocean of stupidity.
EU stupidity was forcing the carbon issue. I don't think this whole thing can get far in the courts, but you never know how stupid they are....
ps. I have to apologize to Penny. I said there were never any conspiracies, only stupidity, and here we have Conspiracy to Commit Stupidity. I am flabberghasted.