If there's already a consensus at the article, you won't need to do all the reverting yourself; other users interested in the topic will be able to make them, too. Then you will avoid 3RR. If there isn't any consensus yet, build it there through discussion and, if necessary, dispute resolution. If the user repeatedly edit wars against consensus and will not work to resolve the dispute, the user can then be sanctioned. (Disclaimer: I know very little about the subject matter, as I'm not British and thus don't know much about the political parties of the UK other than Conservative and Labour, so I won't be any help in this respect.)  (talk)