Anyway, it doesn't really warrant a full-on fire guard, as there's no heat to be protected from. We were mostly worried about delicate heads meeting concrete-bases or cast-iron (imitation, probably) edges. This cushiony thing seemed to be the answer, it's cut-to-sizeable and comes with handy 3M sticky pads to stick it on. We cut, and we stuck (stack?), and now its hopefully a little safer. Sure, there's still the sides that he could whack his head on, but we can't protect him from everything, and there's a world of worry ahead next summer when a toddler-shaped J-cub meets the garden and all its concrete/brick/stoney delights.
Now that we've done it, I bet he never, ever falls anywhere near it. Or, if he does, he manages to hit his head on an uncovered bit.
Day 43: Mission complete.