I remember when I lived oop north seeing lots of bistort, the stuff you roll up with egg, porridge oats and bacon fat to make Easter ledges pudding. It must grow in Cornwall but I haven't seen it. Moschatel will be out by now. I know one or two spots. I have a list of hundreds of plant species I found in Radcliffe in the early 1970s. It would have been longer but for the fact I wasn't very good with grasses ands sedges!