Reply to BPM Calculator that will change the file name

Being a lazy shit I cant be bother to update all my Mp3 file names so that the title includes Camelot info and Bpm. Does anyone know of a free bit of software that will do it for me? Its not that technical surely. I've tried this one
Mp3tag v2.55a, it doesn't seem to have a Bpm Calc, and this one Mixmeister BPM Analyser, which is cool but you cant change file names automatically. So help a lazy dj out and ping me with any suggestions.
Thanks