ahhh, it takes 2 seconds to change the globe, assuming you own a Phillips
screwdriver. There's 2 screws on the tail light, undo them, then bang the
tail light away from the centre of the car and it will unhook. - no 4 year
apprenticeship required for this.

Hope it wasn't tap water you've been putting in the battery.

The battery i use in my EA is a 12 plate, or heavy duty  over the next 5
years the now 12 volt battery is too slowly vanish, i watched a program the
other nite on how the present battery is not good enough to fully operate
all the functions in today's cars. Gps, dvd, all in all 1800 functions. The
tv program explained how a newer 42 volt battery is being designed and will
be fitted to cars after perhaps 2010 or later.

As for the rear tail light, could be a bad circuit, or is earthing some
place or the globe has worn slightly to such a point where the contacts dont
touch fully all the time, perhaps the spreings have compressed where it
shouldnt. I found on light rainy days the EA built up moistre and at times
caused me hassles. So i drilled 2 internal 1/8 inch holes and glued a length
of plastic tubing from below the tail light out on to the road way. No more
blowing globes and the moistre seems to be far less.

Good luck

Peter