For a start, CP is a Pye label and they were massive and had huge distribution, so they are certainly going to make a lot of demos. Philips issued no demos at all during the mid 60's, just stickered ones, after that they put out as many as others in the polygram group (polydor/philips/mercury/fontana) but their distribution was obviously very poor at the time.
Chubby Checker was selling records in 1961 but by 1965 nobody knew who he was, the Beatles had obliterated him and all of the other US imports and even Elvis was barely selling a record in 1965 so I bet if they had the figures that it would have sold less than 50 copies, seriously.