Its taken about 6 months for me to pull my finger out and get it sorted but Ive finally got a new exhaust to replace the standard pea shooter. Its a Piper 3 and a half inch inwardly rolled tail pipe in case anyone was wondering.
http://homepage.ntlworld.com/billhemsley/car/exhaust.jpg
At tick over it makes quite a deep sound before it goes a bit quiet between 2-3k revs then after that it comes back in. Starts booming a bit once you get well into the revs but I can live with that.
Rick