@gilla.walmsley sorry for the delay in answering your question. I bought Netafim t-tape direct from online supplier LBS. Dripper spacing is 20cm. It lies on the ground and held in place with metal ties (U shaped pieces you push into the ground). The t-tapes drippers must face up so that dirt doesn't block them. Water bubbles through and automatically drips down the side of the tape onto the ground. Did you look at t-tape when you costed the system at c. £2K? I space lines 25cm apart lengthways up the cutting beds.
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