Simon

A few things. Dont get over hung up on retricting hip turn. The hips should move in the backswing to coil the body. The key is to make sure you retain the angle in your right knee so that as you swing back the hips turn into this braced right side and can go no further.

This is why you should think of it as a back 'swing'. If you make a fluent turning motion (i.e. not too slow) the inertia of your turning upper body keeps going even when the lower body (hips) cant turn any further and indeed start to recoil. By forcibly trying to not let the hips turn with this motion, well I just cant see how you could do that myself ?

As for the behind the body bit be careful about perception. The hands should go behind the body, as long as the club head remains in front of the hands. You may have gotten used to a wide. steep plane in an attempt to hit the ball further. The guy who you think is whipping it behind him may well be on the perfect plane

Next time at the range try this and see if it works for you. When you take the club away really try and zip it behind you. By that I mean try and imagine a line drawn at 45 degrees from the ball past your right foot and swing it along that line (i.e. not in a straight line back). As you do this try and feel your wrists setting early (they should do anyway because of the more rotatational angle) so that by halfway back the club head is past vertical.

To get there dont use your hands as you will roll it inside. Try and use you upper body but feel like you are turning it away immediately. To you this may now feel way inside but you should immediately notice the more circular motion. Then try and hit some balls and see the difference

This is the premise of the swingsetter. Getting the wrists set early and the club working inside. Indeed heres some of the bumph

http://sportsillustrated.cnn.com/ins.../early2_sm.jpg