Great place to visit and the No Photo call is I think more to do with the owners of some of the aeroplanes maintained there.
As far as I am aware the 109 had some engine issues that facilitated its return to the engine rebuilders for some tweaks, the 109 is not owned by BHHH and I am guessing the owners want to do a press release at the time of its first flights. Do not blame the owners and I have had a good look over the 109 and its stunning