Thanks, some good points here. I have a habit of planning for the worst case scenario, but generally come back a bit to get a reasonable balance! I had considered a running backstay initially, but then went against it because of the added hassles, but I believe you are probably right Mark.
As convenient as it is being able to furl the headsail in strong winds, I'm concerned that if there are any problems whereby I have to drop the sail (as unlikely as it is), I will have to unfurl the headsail which wouldn't be ideal, especially single handed. I guess though if I had crew, I could just send them up!
Rob - I'd be interested to hear how that goes. I've seen those somewhere else and had forgotten about them till you mentioned them. They seem a great compromise, though there'd be a fair bit of windage from the furled headsail, so with the storm sail attached the forces on both mast and deck fittings would be quite large (I'm guessing?). But, again, seems a reasonable compromise. And like Mark says, it's pretty easy to plan coastal trips based on weather forecasts these days, probably including a hop to LHI.