spasypaddy Excellent - thanks. He'd run out of black when I ordered this last week, but is going to send me one out tomorrow. If it's a nice snug fit and there's no mess between the funnel and the portafilter, that's perfect.
Just out of interest, do you warm up your portafilter in the group before you load your grinds? Mine gets pretty hot and hadn't considered whether this could warp the printed material.