This looks a bargain for all of you with water butts ;-)
Garden watering direct from your water butt. Ecological water saving, this micro irrigation system drip feeds water direct to plants whilst saving up to 30% of the amount of water you use. This kit comprises 36 drippers in total. Each dripper is assembled on a 4 dripper manifold on 30cm dripper tube. The 6 x 4 drippers are supplied on different lengths of supply pipe - 3 x 60cm, 3 x 120cm and 3 x 240cm. 5 metres of garden hose is supplied to attach your kit to your water butt.
I checked all the stores in my area and all have stock.