WHY was tail docking made illegal in the United Kingdom?

Yet another example of British Dog Law being a bit on the stupid side... I know it is illegal "except for medical reasons" but WHY was it made illegal? And what kind of medical reasons? The tail getting caught or injured because the dog wasn't docked?!
Update: PLEASE READ: Before you write about how 'cruel' it is, I advise that you look up the kind of injuries working dogs are sustaining from UNDOCKED tails. You are making yourself look like a moron if you post OMG IT IS SOO CRUEL. Thanks :D
Update 2: Voelven: You are NOT included in that rant. I didn't realise it was same in Denmark. Thank you for the knowledge.
Update 3: Memphis Belle my lovely, your question has half disappeared :P
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