The two playing Groucho and Chico really have got their accents and mannerisms down to a T. First t ime I heard them, I thought they were the real thing. I'd also say (I know this is blasphemy) that their timing is better than Groucho & Chico's on the original recording of The False Roderick.
Regarding recording quality, the file names BBC... and FlywheelShysterFlywheel... sound a little muffled, while the FLYWHEEL_SHYSTER_and_FLYWHEEL... ones are clearer and louder. The latter are duplicates of the others but they only cover the 1st series.
If you want to match them up, until the filenames are changed to show this, their original dates are as follows:
FLYWHEEL_SHYSTER_and_FLYWHEEL_900602_The_Missing_
Rembrandt.mp3
FLYWHEEL_SHYSTER_and_FLYWHEEL_900609_the_actors_
pt1.mp3
FLYWHEEL_SHYSTER_and_FLYWHEEL_900609_the_actors_
pt2.mp3
FLYWHEEL_SHYSTER_and_FLYWHEEL_900616_the_
gangsters.mp3
FLYWHEEL_SHYSTER_and_FLYWHEEL_900623_situation_vacant-Foo
Foo.mp3
FLYWHEEL_SHYSTER_and_FLYWHEEL_900630_the_
Boxer.mp3
FLYWHEEL_SHYSTER_and_FLYWHEEL_900707_the_
election.mp3
Lastly, until it's cleared up, The Devil You Know is actually a Yes, Minister episode of the same name.