If I’m certain about one thing following my recent family holiday in Cornwall, it’s this: The Lost Gardens of Heligan are a lot easier to find than the Eden Project. I’ve read that Eden – an extraordinary ecological experiment, which houses rainforests and Mediterranean flora in big glass domes – has attracted several million visitors since it first opened. All I can say is that it’s a bloody miracle, because the signposting is truly atrocious. Once you’re there, however, there’s no doubt you’re bowled over by the scale of thing. It would probably take a few days to go around if you were David Bellamy and interested in the names of the plants and stuff like that. For me, one Astrocaryum murumuru looks much like another, so I was focusing more on getting jungle-style selfies from great heights. The Eden Project has been in the news over the past year, which I suppose makes it a topical rainforest. Unfortunately, it’s been hitting the headlines for the wrong reasons, a...