So, it would appear that not only have I managed to do C25K and beyond with a dip in thyroid levels, but also with undiagnosed iron-deficiency anaemia (a ferritin level of 4) and a vitamin D deficiency (halfway between the bottom of the recommended range and the bottom, full stop).
Christ.
Which begs the question: if I can do the running and feel pretty good afterwards, and post respectable times / distances, what's going to happen when the supplement pills kick in? I very much look forward to finding out!
Anyone else found out they were actually in woeful shape whilst thinking they were doing really well?