We went up in a helicopter once at some event or other. A fiver for 10 minutes in the air! It was near home, an area I knew very well on ground level, but once we were in the air, whooshing around over this familiar countryside, everything looked different and I very quickly, completely lost my bearings. I’m still ashamed of this! I’m good at maps; I can usually tell where north is without a compass; I knew the area well. And yet …