well, depends on how much you believe about this asbestos thingy. Your pipes probably have white asbestos in them, and the exposed bits are probably painted, so present no problem atall whilst left undisturbed.
And little problem when removed.
You can remove them yourself as far as I know, you need to take normal precautions against inhaling dust etc (overalls, mask gloves) and use a vaccuum cleaner with a good filter on it to clear up ALL the cr*p, then dispose of the mask, gloves, overalls and vac filter and dust bag) into the same bin liner (well known terrorist) as the unwanted pipework.(obviously you should avoid breaking the pipes up if atall possible, or cutting them up.
Then contact your local council and tell them some pillock left some bags of waste by your gate....