Yes,he has.He's involved in all the Brothers In Rhythm-productions and also done a lot of producing for mainstream artists like Sugababes and Take That.The question is if this has made him as big as he is dj-wise.Personally,I'm not sure.
Dave Seaman has been associated with Kylie Minogue as well.
he's remixed and produced quite a lot under the Brothers In Rhythm & other monkiers.
he's mainly worked as a studio sound engineer (much like Charlie May) for many mainstream artists. (you know how some songs would sound wicked without the poppy cheeze vocals)
essentially, most of the well known dj's need to be full on producers/remixers as well
of course there's gonna be arguements over whether or not Paul Oakenfold can produce...