Googlefu fail, what sort of pipe is this?

50mm blue MDPE water pipe will do nicely for this function. I've seen other polytunnels made with it. It is widely available at builders merchants or plumbing centres. You should find somewhere locally to buy a coil of 25m or 50m.

Polytunnels are ace by the way, I've had 2 from first tunnels over the years. I have one that I brought with me from my last house that I need to re-construct, maybe next year.

Thx PC, thats the plan, I am just debating making vs buying, so costing up.

The issue for me is the odd size we are allowed (2.5x3m) virtually no one makes this size so if I buy 2x3 I am losing 20% of the space.

Screwfix dont have the 50mm which I agree looks about spot on, online its available though but will check out a decent builders merchant to see whats there.
 
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