Bob Hobden wrote:
One thread I noticed got mixed up was "Which is the best plant to be grown
in the UK?" 20/07/2010 09.40.
It then starts to get replies to "Greenhouse questions" as replies.

Can anyone not using Windows see the mix-up?

Yes, it was cross-threaded:

1 [ 10] Which is the best plant to be grown in Harryg
2 [ 13] +- kay
3 [ 22] | +-Greenhouse questions Lordspudz
4 [ 20] | | +- kay
5 [ 26] | | | `- Kate Morgan
6 [ 42] | | +- Jake
7 [ 21] | | `- soup
8 [ 12] | | `- Lordspudz
9 [ 30] | `- Mike Lyle
10 [ 14] +- Stewart Robert Hins
11 [ 23] | `- Dave Hill
12 [ 9] +- bobharvey
13 [ 14] | `- harry
14 [ 30] +- Bob Hobden
15 [ 14] +- sutartsorric
- 16 [ 19] `-Which is the best plant to be grown Jake

Which would imply it was either Lordspudz who (accidentally or not) followed
up in one thread to a message in another thread and changed the subject
accordingly, or that gardenbanter (assuming he posted from there, but that
looks like a gardenbanter type username!) had a bit of a brainfart moment
and the threads were crossed by them. It's definitely crossed out in the
wilderness of usenet, not restricted to anyone's newsreader.