Campsites in Gorges du Tarn area

We're planning a trip in June and thinking of visiting the Millau or Gorges du Tarn area. We'll have both camping cheques and an ACSI card. We've seen some of the earlier disussions on campsites in Millau, these look most useful. Has anybody any experience of Les Peupliers or other sites at Rivière du Tarn or, indeed, of Val de Cantobre a little further south?