You could try Chateau Drancourt - in St Valery sur Somme - just a short drive from the crossroads of the A16 with the A28 or just slightly North of Abbeville off the A16 is Ferme des Aulnes at Nampont St Martin and within a stone's throw of that site is Ferme d'Authie (these two are both in Camping Cheque book) - Drancourt is in Les Castels brochure and also Caravan Club - may also be camping cheque but cannot remember at the moment.