Won't go into too much detail but have been on various BP meds for the past few years and sadly had them increased last year (my fault... Increased weight and zero exercise).
Since starting C25K, my BP has been slowly dropping over the past two months and for the first time last night actually read as low! Hopefully my GP will agree I can go back to my original meds and can stop taking the additional tablet prescribed to me last year.
So, this running thing really does work. Yes losing over a stone in weight (mostly before C25K) has helped but it hasn't had the same impact that the running has.