I would say the snake catcher was right and it was a white crown snake. They're pretty common in gardens and not really anything to worry about being bitten by. There are many mildly venomous snakes that won't cause any more harm than say a bee sting or localised swelling and a bit of pain and/or nausea. White crowns don't get that big and yes they prefer to 'head butt' rather than bite, not that anyone should test that theory. My parent's cat catches them all the time and brings them into the house, their cat catches anything that moves... I love cats, but I really wish they'd keep theirs inside away from the wildlife! If he brings in anything bigger like a tree snake, I get a frantic call to come and catch it. Snakes really are hyped up to be worse than they are. Fair enough that people are scared of them, but there's no need to kill them, snakes quite often are just moving through looking for a meal and don't 'live' there as such, and releasing one a few streets away will get rid of it. Venomous ones are best left to snake catchers who know how to handle them safely, sometimes trying to shovel them can actually be more dangerous than leaving them alone, if you're waving a shovel around at it, it's going to feel threatened and be a lot more likely to bite! Most snakes if they don't feel threatened will just go the other way. Sorry for the rant but I used to keep and breed snakes and they're really not the big scary monsters that people think they are, people are just misinformed and inexperienced. They're wild animals surviving like everything else and deserve respect like anything else.