Well my battery has been acting a bit tired the past month or so I decided to check the levels in the cells, and sure enough all six cells the lead was just exposed above the acid, so a quick to up with de-ionised water, and a literly a couple of hours on the charger, and its as good as new.
So don't splash out on a new battery before the Winter kicks in just yet, do a quick check, you never know!!
Just to add to that I noticed the battery to appear worse when parked on steep slopes when the levels where low, not a problem since.