This from my NOAD2:
USAGE There are two possible pronunciations of the word controversy: one puts the stress on the con- and the other puts it on the -trov-. The second pronunciation, though common in Britain, is still held to be incorrect in standard American and British English.
--220.127.116.11 21:10, 6 February 2010 (UTC)
- The second pronunciation (with the stress on the second syllable) was once recommended by the BBC pronunciation unit, and used by BBC announcers and presenters in the UK. The pronunciation department changed their minds (was it in the 1970s?), and nearly everyone in the BBC now puts the stress on the first syllable, with a secondary stress on the third. The earlier pronunciation can hardly be regarded as "wrong" in the UK, but it is beginning to sound dated. Dbfirs 11:52, 1 July 2012 (UTC)