Anyway I decided to listen to H.A.A.R.P. the live Muse Album of their 2007 Wembley Show on the "Black Holes and Revelations" tour. I was given the option of stereo or DTS , no 5.1 option. Switched to DTS option there's nothing . Tried DTS options on a couple of other DVDs, still nothing. Checked that fount of all knowledge , the internet , and someone suggested that the digital sound stream should be bitstream rather than PCM. What the hell does that have to with DTS? I don't know.
Anyway may that adjustment and lo and behold we have Matt Bellamy and co escorted out to the sound of Prokofiev's "Dance of The Knights(Montagues and Capulets)" from "Romeo and Juliet" before launching in to "Knights of Cydonia" and shaking the house to it's foundations. Job sorted!!