Andy_Langton - 6:37 pm on Feb 21, 2013 (gmt 0)
Spot on in terms of the redirect. But I would take a little more time to ensure your URLs are as ideal as possible, because you are talking about (essentially) creating new content as far as Google is concerned, and then attempting to pass back the value from your old content. Anticipate an amount of initial loss of value, even with a perfect implementation.
So, I would start with what you might consider 'perfect' URLs and work back from there. The technical side is, in some respects, the easiest part :)