My heart rate has always been like this, at my peak fitness it was about 45 bpm resting, although that was a few years ago now! I have always had slightly low blood pressure too. This may have changed recently with the weight increase, I will be sure to ask the GP how this may affect my training.
This monrings run was indeed more about staying relaxed and concentrating on my running form, than about times. I am experienced and realistic enough to know what my body is capable of at the moment and will not push beyond what I think I am capable of acheiving. For now I just have to build up strength and stamina. Speed will come later hopefully!
Thanks for the help TheEd!