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Thanks a lot Graig,

I have learnt a lot from my small question. I did not know there used to be good old days where you were legally obliged to grow hemp.

Sure, the straw could be anaerobically degraded in nature,.. if it gets a chance to get underground before being some insects or mushroom lunch in between.

I also heard about using that type of by-products for methane production in bioreactor for bio fuel for car or heating.
I did not realised how small the entire UK house-building programme is compare to the bio fuel market. Because I have been told (maybe I should have closed my ears) that all agricultural by-product could only cover a fraction of our fuel demand.

After all, if we get a choice between building our house, heating it or driving home, it fine with me.

Good luck for your business anyway!

Valère