I have some time off this coming week (finally) and I am going to my medic to see what he has to say about it all. It's worth getting a second opinion, certainly.
All the osteopath had to detect this was his fingers, just taking pulse manually. Fair play, he located two of the three rather anatomically difficult pulses he was looking for - the cause of concern is that he couldn't find the third, and the other two were out of sync.
If this is indeed a symptom of coarctation of the aorta, which causes hypertension, then one option is balloon inflation of the aorta (fun trip, guys!). However, in the first instance, the medic would probably tell me to a) have a good diet, low in fats and salt and b) exercise.
Done, and done!
One problem is that I may have poor extremity circulation as a result - great for frostbite in cold environments!