I have been on medication for bp for quite a few years and I am now in the process of reducing it with my GP's blessing - so it's not all a one way street.
It might be worth investing in a good quality home monitor. My blood pressure would shoot up as soon as I walked in the surgery, but strangely during the times I was a hospital in-patient it was usually around normal. If your readings are otherwise low you might persuade your GP you have a bad case of 'white coat syndrome'. Otherwise you could ask to be fitted with an ambulatory monitor - athough I found this quite an unpleasant, it might give a truer picture.
I was lucky that before medication - with readings somewhat higher than yours - I was referred to a cardiac specialist who understood running. He encouraged me to continue and said that both beta blockers and diuretics were out as far as he was concerned. He then suggested a low dose of Candesartan cilexitil which I found had no side effects.
If your GP decides on medication as a first resort I would suggest you ask for a second opinion - as neil says exercise is generally recommended and usually advice given regarding diet and salt reduction are also tried before medication.
Although less likely to be a problem for this paricular event mud can be a real killer on the Ridgeway. The first section to Goring can be incredibly hard if there has been any significant rainfall prior to the event. After Goring the going is easier, but the chalk can be tricky if there is surface water.
I asked for a plastic bag (duly recycled to put my muddy shoes in). Yes the last section is a bit.... but much better than the original finish at Barbury Castle which was just a large freezing tent and rather nasty loos - no showers, changing facilities etc. Btw - was it you in the onesy on Day 3 - was a bit dozey and just saw a colourful blur.
Hi MuddlingAbout - great to meet you. I finished about 10 to 4 on Day 3 - about 20-30 minutes quicker than my normal slow plod. Even with a much later start on Day 2 I found it cold and did a quick divert into Goring to buty a pair of gloves (along with the Saturday papers) as my hi tech waterproof ones were still wet through. The low tech £1.50 pair I bought did very nicely.
Will be entering the Cotswold event so see you there Richyla.