Hi Rachael, SPPAWA,

I will try some exercises to strengthen the muscles you suggested Rachael thanks

I do have a very mild Wikipedia reference-linkscoliosis, which has never bothered me or limited me in anything (I wasn't aware of it until I was 28!!). My pain only started after I strained my pec minor. I can pin point the pain, it can vary between the following places:

Round about my 4th rib on the front of my chest (my Wikipedia reference-linkmri showed nothing there).
The side of my shoulder blade closest to my spine and at the bottom of my shoulder blade.
My neck - upper traps mainly at the back, but can also be on the front outer area of my collar bone.
Occasional dull ache under my arm, as if the whole 4th rib is aching.
Down the outer side of my arm and my pinky and ring finger can ache and occasionally have a very dull sensation of pin and needles.

Thanks again for your help

Nik