TO,
Have you tried the
SIA website (the French equivalent of the UK AIS website)? It has the French AIP (including an English version) with all the airfields in it. The customs info for Amiens says
9 - Douanes : LUN-VEN : 0600-1600 - HIV : + 1 HR - En dehors des horaires : O/R AFIS PN de 6 HR
Brooklands