Anyone else think that the tip for Challenge 6 is confusing?
“This week it really might pay to decrypt Challenge A first, if you want a very slight clue to Challenge B, though that might be misleading!”
Is it supposed to help or confuse people?
If people are really stuck on 6B try something a little different. The frequencies show you that the letters appear in the same proportion as they would in English so maybe the text has been jumbled using some form of transposition cipher, rather than a substitution cipher this time.