I was under Codemasters too, but I have to disagree with this idea because Codemasters had very bad protocol in interpreting the issue. Technically, killing another player is not an exploit because it's something that is implicitly allowed; using an argument that the said player randomly gets killed by the same player could be defined as camping, which is something natural in PvP. At its end, I don't see anything wrong with clubbing because it's something present in all MMORPGs. If there was something Turbine didn't intend, then that's considered an exploit. Besides, clubbing is a tete-a-tete affair and does not intervene with the affairs of other players except the parties involved benefit. When it comes to exploitation in PvE, because all players are linked by the environment as a whole, that's when one player can, with everyone else, issue the same exploit thereby being problematic.
Besides, how would you rationalise clubbing? Let's find some definitions:
1. The continuous killing of a certain player to earn battle points:
Let's assume we're in a tournament of some sort: would I be clubbing if I were dueling a player of the opposite faction but coincidentally keep losing? Would that be classed as clubbing? and should I be banned for it?
2. The intent to gain an unfair advantage over other players by engaging in free-form PvP:
By this, I simply mean the off-chance that you so happen to be gaining an advantage by coincidentally killing and winning against the same player continuously. In essence, PvP is meant to be free-form and there are no right or wrong answers in strategy. If it so happens that a certain player has unfair advantage, then that is subjective and that leads to most thinking it is a form of clubbing.
My judgement on the issue stands, and certainly there's nothing mutually irrespective of clubbing. Rather than whining about it, why not intervene by force? That's how most PvPers get involved; if something bothers you, then use force to deal with it.
To conclude, PvP is an anarchic system and it's really a matter of player-choice to decide what goes. Any effort to reduce player choice simply causes problems within the PvP arena due to elastic the aspect of gaming is. (Of course, anything can be classed as clubbing!)