Inconclusive sighting

I'm uncertain about this one, it could possibly be a Bovista as well but the way in which the fruit bodies have become compressed and dented they seemed more likely to be a Lycoperdon sp.

I agree with your two possibilities, but won't pick one. In Lycoperdon there is a sterile base below the spore chamber. It's a bit like a semi-solid, spongy foam. In some species this shows as a pseudo-stem, giving the whole fruitbody a pear shape. However, there are also more or less spherical species, sometimes with that sterile base not very well-developed. Species of Bovista lack a sterile base. Sometimes I need to cut a fruitibody vertically in half in order to be sure if there is or isn't a sterile base. It pays to do so with a very sharp razor blade.