OK, went out with the lad on a weekend trying to get some slightly different angles on our car. Ended up hanging the camera out of the window on a monopod. Tried a range of speeds/aperture, this was one of the better ones although it was surprisingly difficult to get sharp car and blurred background. This was at 50th sec with IS, could possibly have benefited from a slightly faster shutter as I think the focus is about right.