It is legal to do it at a licensed airfield, it is illegal to do it at an unlicensed airfield. Rule 5 and its clauses.
I'm aware of Rule 5 thanks. What I was suggesting that at a private strip
in the middle of nowhere that there is little chance of overflying a built up area, or person, being or object and (not that I'm advocating low flying) it would be safer to do a low approach and go around to check out the condition of the strip (for rabbit holes etc.) than to do an overhead join with binoculars at 1,000ft + ? In addition, if anyone were ever to jump up quoting rule 5 etc, then surely the simple answer is "I saw a rabbit / deer etc." running over the strip so I went around?