I can't help you with number 3, MissBoots, but I don't think number 4 is 'The Sound of Music'. Fah should be between mi and so but the only titles I can come up with as yet are 'Far away' and 'Far and away'. The first fits the clue but doesn't seem well-known.
If you've got number 16 of the quiz, I'd appreciate a clue - I recognize where three of the names come from but just can't think of the answer.
Thanks quizling and MissBoots. I was thinking along the lines of one of the names not being in Cluedo, but I'm obviously looking for complications that don't exist.
MissBoots, so far I've only thought of 'The GoBetween' or 'Silent Witness' for the Tom/Dick/Harry one but neither seem convincing.
I'll probably end up putting 'Driving Miss Daisy' for the Chauffeurs one through lack of any other ideas.
Thanks for the suggestion, mags51, it's better than the ones I'd thought of.
I'm probably being slow but I've only just got round to Googling Miss Peach and found out she's also a character in some editions of Cluedo. I'm wondering if 'The Ladykillers' could be the answer to this one although I can see why people have gone for 'Little Women'.