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You have all made very vaild points and I thank you for taking the time to answer. I am not technically minded, far from it, so, as it has never been explained to me or anyone else who has suggested it why it couldnt really be done, blocking IP's was the first thing I thought of.
You are right goodsoulette, there is one or two who I like but can misbehave themselves but they do not go as far as some others. Maybe if the ones who are really nasty get banned, the others would calm down and use the site properly as they do when the nasty folk arent around.
I have no solutions to this problem, if there is one that would work for all users, but surely there is more the technically minded and Ed can be doing to help prevent such posts in the future?