Feather or Iron Fist?
Politeness always pays. A gentle letter to all base users could be the first step, and a change in the "Authority" will be sufficient excuse to clarify the regime under which the airfield will now be run.
I don't for one minute expect you to do this [what follows that is], but it reminds me of a situation I had in Scotland at a remote location. The airfield was PPR, however one chap used to fly in with his Beech Baron complete with dogs etc. on shooting trips; I'd walk over to my little tower and think Hello Hello...where did he come from.....anyway, on one occassion, during the next day a storm force wind blew up, and to protect the plane we parked a Fire Engine in front of it and tied it down [the plane that is]....next evening irate pilot phones me at home threatening all kinds of retribution if I didn't move the Tender......maximum diplomacy and polite chat worked a treat...no more problem thereafter. He'd merely misunderstood the out-of-hours procedure.
An airfield close to Southampton has no ATC/AFISO/AG, nevertheless the Operator requires each and every pilot to record flight details/POB/endurance/ETA back at base [if returning] in a centrally located self-briefing room; common sense would dictate that this is a valuable safety feature if nothing else!
Good Luck.