low BP / postural hypotension is not usually treated in the UK although it is in other countries
I’m not sure about that, we do treat it here, but usually only if it’s giving people proper symptoms like passing out and/or falls. First line treatment is just to increase fluid (+/- salt) intake for most people anyway, though there are some drugs we also use from time-to-time.
But unless you’re falling regularly, it’s probably nothing to worry about.
IIRC (and I am pushing the limits of my knowledge) postural hypotension is not always connected to low baseline BP
Yeah, this is true to an extent. The body’s ability to adapt to a change in posture (by vasoconstriction) is modulated separately from control of BP. In fact, there is a group of people with both orthostatic (postural/standing) hypotension and supine (lying) systemic hypertension (sometimes called SH/OH) which is, as you can imagine, quite difficult to treat.
@ OP: If you didn’t have a fancy new watch, would you have any idea your heart rate was low? That’s as close to medical advice as you’re getting from me 🙂