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Mark Ronson has managed to spend plenty of time at the peak of the Vodafone Big Top 40 at the beginning of 2015, but somehow he managed to fit in time for a catch up with Rob and Katy.
Could he manage to Uptown Funk up Rob? What's it like being so high up the chart? And just why did we decide to accuse him of being a thief? And is he American or British? We just never can tell!
Find out by listening to the interview here: