>> should only move out to the left to overtake someone,
>
> Are you sure? About the 'only', I mean.

In the UK at least, yes.  See rule 264 here:

http://www.direct.gov.uk/en/TravelAndTransport/Highwaycode/DG_069862

Also rule 268 allows you to "undertake" if the conditions are busy and your 
lane is simply going faster than the other lanes (ie you are not expected to 
brake to avoid undertaking someone if the other lane slows down).

But crucially there is no "MUST NOT" related to any of this, so it seems 
there is no specific law that applies in this situation.  I assume it would 
just be down to a police officier whether he judged what you were doing as 
dangerous or not.  You would probably need a pretty good explanation as to 
why to undertook given that the highway code tells you not to.  I don't know 
whether they would accept "someone was hogging the overtaking lane" as a 
valid reason.

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