In his weekly Jamie’s Little Allotment column, gardener Jamie Marsh talks about hardening off. As gardeners and Brits, one of our favourite conversations is about the weather, what it’s been like, how wrong the weatherman has been and what it’s going to be like next week. This last week’s weather has been a big talking point, three days of 20 degrees and bright sunshine then the high winds arrive, blowing everything in their path all over the allotment and then the last two days rain, hail and even snow. But the main thing that us gardeners are looking for is frost, and we haven’t seen hide no…