Guys, Thanks for your comments, I thought I'd let you know the outcome.
As suspected it was nothing to worry about. What a relief
I decided to go to the CAA at Gatwick and, I too found them very helpful.
The problems in my case (for the more medically minded) appeared to be one of interpreting measurements. As mentioned above, it would seem that none of the tests are to be taken individually and a specialist takes every thing into account to get the full picture.
The BP readings previously thought to be approaching the high side was put down to the arm cuff being to small for my arm! A larger cuff gave a 120/80 reading.
The unwanted negative blip (in very laymen like terms!) on the ecg trace came down to the electrode picking up activity on the opposite site of the heart to that intended. Something to do with the heart orientation etc.
Either way, the time on the treadmill was easy compared to the gym/pool so I was given clean bill of health.
cheers.