I’m on top of the world! That’s a bit of a lie in respect of a large swathe of my existence, but physically, I do appear to be sitting on top of the world. I’m not even talking about my body’s physical state of health, although I do try to retain my respectably svelte, snake-like physique (I actually make Mo Farah look like he could do with easing himself away from the buffet). I’m talking …