OK, I have tried a few things and read some more of other's experiences.
My biggest problem was caused by the boat floating away from me after the capsize.
Disclaimer: I haven't capsized since the my first post on this topic, so everything remains relatively untested.
I am now trailing a 20ft polypropylene (floating) rope behind the boat. So far it hasn't become tangled in anything.
I have viewed Victor Warrior's recent (excellent) youtube offerings. If you are reading this thread, you should too (IMHO).
Victor Warrior has mounted an anchor just aft of the mast that automatically deploys in the case of a capsize. That seems to be effective at stopping the boat from floating away. While in awe of his skills and ingenuity, I feel that it might be overkill as the anchor will get in my way (as does everything). I would also be concerned as to the length of anchor rode (rope) needed, which would depend on depth of water. Simple when you sail in relatively stable depths of (especially shallow) water. Not so easy when you sail in water of very variable depths or very deep. My (untested) trailing line seems like it should be sufficient. I do accept the point made by a poster above who said a powerboat crossing close behind me could snag my trailing line and cause a problem.
I did follow Victor Warrior's advice concerning getting back onboard after righting the boat. I have now installed a very simple rope ladder in front of the mast. I experienced massive difficulty boarding using this rope ladder - it goes under the boat making boarding virtually impossible. So I used Victor Warrior's suggestion of attaching two lines to the bottom rung of the rope ladder that attach to the forestay attachment points at the bows. This keeps the ladder vertical when boarding. I keep the ladder in a bag in front of the mast and deploy it from the water, the two lines from the bottom rung to the forestay attachment points are permanently attached.
I am not so concerned about preventing capsizing. Providing you can recover from the capsize, it should be viewed as part of sailing. Racing car drivers spin off at corners occasionally, it's how they find the limits of what they can achieve. That said, I really don't enjoy the loss of pride
The wind has been howling here lately. I only just managed to get home without swimming 3 days ago.