Left the side-lights on all day and returned to a rather flat battery and some odd results when I finally got it bump started.
1) Kept getting "ESP Fault" when I was trying to get it started, but went away once on the go.
2) Indicator "clicker" in the car going at double-speed, though the wing-mirror indocator lights seemed fine.
3) Bulb warning light on the dash.
All back to normal, (I hope), once I'd driven it around for half an hour to get more juice into the battery.
Oops.