Thankyou for your responses. I have been told im quite a tense person, when im concentrating so hard on playing a particular piece im sure im not in a relaxed state.
I have chosen some easier pieces, "Clementi Sonatina's" The purpose is to try and play and relax and breathe...etc.
Out of interest, Do you think a concert pianist performing something along the lines of Rachmaninoff to a large audience would be in a non-tense state?
So much to think about, a physically demanding piece with the pressure of people watching? How do they do it?..