I thought that may have been the problem. So to sort of test the theory i left the mouse there and went to pick him up (risking a tag, i know). Nothing happened. I picked him and held him for a bit with no problem.

This is my first Boa. Pythons who don't eat are more my strong point. I've had more than a few problem eaters (balls) but have always been able to rectify it. Until now that is.