Hi, Jonathan, and thanks for commenting. Drip irrigation is being rolled out, but too slowly. While it may not be rocket science, it nonetheless requires very detailed calculation of layouts and pressures, allowing for pressure losses due to friction and other factors (which I don't claim to understand!), dosing of fertiliser, if used, the Venturi effect. As well as the optimal delivery for different crops. So it does need skilled technicians to implement, monitor and service, and planners with the right theoretical background to design. It's important to get it right, and ensure it is delivering tangible benefits for the farmer as well as society, I feel. We've seen recently that trying to force environmental measures - and their associated set-up costs - onto a farming sector which is already highly disgruntled (and owns a massive fleet of very slow tractors...) can prove counterproductive.