So anyway the reason i missed the last meet was because the battery was dead when I started her up to leave, and there wasn't even enough juice to get her jump started.
Fearing some sort of complicated electrical problem I sulked for a few days, before I noticed a small piece of metal sitting on the sill.
It was of course the circuit contact plate, normally glued onto the inside of the doors, and had presumably shaken itself loose on one of many busy back roads.
So I recharged the battery, got out the No More Nails and got it fixed up last weekend, just in time for the good weather.
Bummer timing though as I've now missed the last 2 meets!