Well people keep trying to call me when I'm driving, and so Maplins have a blue tooth in car handfree unit which plugs into the cigarette lighter. It had £20 pounds off the normal price making it £15. I was initialy dubious if it would be any good.
However it apirs with the phone well and is simple to use. It gets my thumbs up. Although I guess with the roof down there'll be a lot of wind noise!