On Monday, we began construction of our third polytunnel in the market garden field. At 60 by 30 foot it fits in snugly between our compost site, rabbit fence, veg strips and willow coppice. So far we have marked out the site, dug the trenches and post-holes, and cemented the first 6 posts into place. This is the most time-consuming and mentally-taxing part of construction, as any error can lead to serious problems later on. Thankfully Simon lent us his laser-leveller, and both Hugh and James have built polytunnels before, but we've taken our time to make sure the base is exactly right.