i have read the tv listings today and there's no more cbeebiees at 3:25pm no more instead from monday 4th april cbbc one are covering the slot and showing bodger and badger which is well old now. (8 years old!)
So now CBBC will start 5 minutes before CiTV does and will build up a bigger lead. I suppose that is one of the reasons. Although the afternoon CBeebies slot was just a throw-back from the days when all kids shows came under the CBBC brand, it always looked a bit odd standing on its own.