On Sat, 9 Jul 2011 10:58:28 +0100, Mike Tomlinson wrote:

I'd suggest you get yourself a compliant newsreader. Or learn how
to
use the one you have.

It's not him, it's you. Your headers show no References: lines, which is
what enables threading,

Yet Dave's client at least preserves the References: line when it is
there. His response in:

Subject: Lidl offers from Thurs.
Date: Sat, 09 Jul 2011 09:25:48 +0100
Message-ID:

Has References: how ever Dave has also quoted part of the message he
is responding to there. So perhaps without quotes it strips/doesn't
create References: or Dave had finger trouble.

--
Cheers
Dave.