Damien - to answer your questions from last night:

take ur arms away from your side...bend your elbows, keeping your back straight push your elbows against a wall, what happens? (almost like you waant your shoulder blades to clap but you resisting the movement with your elbows)
A: Nothing

secondly, while sitting, rest your hands on the arm chair and lift up like you would do a reverse dip, do once, what happens? (almost like you want to bring your shoulder blades down,)

A: Can't do this one as don't have an armchair

thirdly, place one hand behind your head and resist taking your head back with your hand, what happens?
if your wife is there, ask her to place her hands on your shoulders, tell her to resist your while you try to lift your shoulders up (like in a shrug?) what happens?

Answer: Nothing

Do you get pain on full range rotation?
if so...fold your arms acros your chest, turn left just before the pain increases...ask your wife to ressist this movement, what happens?

A: No = not pain just a little stiffness. It's not on the same scale as the slouch, chin down pain.
do the same for the right? what happens