blimey it works !!
He advised me to pay close attention to bouyancy in the water .... it seems you only need enough pushing of the buoy effect (ie forcing head under as you swim) to have forehead under rather than head and shoulder right under. He got me to stop breathing.
Just done a two dy TI workshop this weekend Superb, great, well woth the expense! I had a 30% reduction in strokes. My technique improved phenomenally I would never have managed all of this with just the book. The workshops are expensive but worth it in my book A word of caution it takes practice, practice, practice after the workshop too!