Lol! - that says it all. They want you to "screen" a polytunnel. Actual function of polytunnel: to gather light...
Reminds me of a local wood which sat on a lowland peat moss near my old place. Before handing it over to the "Woodland Trust" the local council dug a five foot ditch around one side and stipulated in the deed that the trust were to maintain the ditch... which was in effect draining the moss and ruining it. The "Woodland trust" amazingly accepted the provision. Years later the whole moss went on fire as all the peat had been drained and indeed it burned internally for weeks. They also dumped about 20 tons of shale blaze on part of the wood to use as a car park for "public access". The spot where I used to see Butterfly orchids sprinkled around is now replete wit used condoms instead.
Alas for idiot Councillors whence spring idiot MP's: shit floats.