So when I first got my iPhone 4S I wrote:

“I see it really being of use to me when I’m in the car and a text message comes through: Siri can read it out and send a dictated reply. It’ll be interesting to see if that’s done through my Mazda RX-8′s Bluetooth sound system or the iPhone’s loudspeaker.”

Well there’s some good news and there’s some bad news.

The good news is that yes, it works through the car’s Bluetooth sound system, so it mutes any music and reads out the text messages.

The bad news includes:

• “Uh-kay” being said before most things it does.
• If you haven’t got a web connection it’ll say it can’t do anything right now, like reading something stored locally.
• The voice recognition at anything other than walking pace is pretty poor, actually, and I’ve now started simply sending bizarre text messages in reply to people rather than spending hours arguing with Siri when it comes up with gobbledegook instead of what I actually said, thinks that I said “danger” rather than “change it” and claims not to understand danger (big, brave Siri!)  and sometimes even picks a track from my music library to play in an attempt at being ‘helpful’.
• Won’t perform a web search because I’m in the UK and using proper English.