Thank you Sqad - I can't say there is any pain at all, just a bit of irritation which I only notice if doing nothing which requires attention. A judiciously chosen blinking regime brings up crystal clear vision, not that the slight distortion is particularly noticeable unless one concentrates on it. The blood is then something you reckon (as I guessed/assumed) will drain and be absorbed in time ? The "pouch" is a visible slight bulge on the eyeball, I assume it is just under the outermost layer/membrane - it is just within the visible part of the eye and beside the bridge of the nose.
Since posting my question, I have found a useful page and the image here is of something quite similar although mine is nothing like as extensive as the subject's:
https://www.msdmanuals.com/home/eye-disorders/conjunctival-and-scleral-disorders/subconjunctival-hemorrhage
For the others: Getting to a doctor is, due to my present circumstances, quite a palavra - phoning a centre (a box ticking screen exercise in all likelihood) would in my estimation achieve nothing better than getting Sqad's assessment on here. It had just happened and my first thought was to quickly ask - on AB, where else as a first port of call (wasn't that the original idea behind AB's creation) ?