Go to £streacher and they do an Irrigation system for £5 its about 30m of pipe and 20 drippers. The drippers were crap so I pushed a nail thrught them. I connected mine up to a water butt and went away for a week and all was happy and nice when I came home. The kit contains fittings so you can connect to a tap.

also look at Lidl / Aldi/ Netto/ Robert Dyas and Wilkinsons.

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