Dear Gallen
Just to let you know what happened. I stopped practicing the active exercise for quite a while and just did the meditations.
When the pain had gone for quite some time I started again slowly as you suggested and focused much more on the lower dan tian as you suggested. I also adopted the attitude that should the pain return it was going to be good for me (as in it being healing pain). I was actually looking forward to it. I have not had the pain since I started again. I've now been practicing daily for some weeks with absolutely no chest or other pain.
Thanks for caring and answering in such a detailed way.
Colin
