If that's the case, then, why not take the tour, sans camera, and have a look around to decide what you want to photograph, if anything. After the tour, if you are so motivated, make the approach for permission to photograph.
P.S.: If it is an old distillery, certainly make the pitch that photos will be (or SHOULD be) taken with an "old" camera. The appeal to tradition has its merits.
I must admit that my interest in taking pictures of this place was not strong enough to arrange for a paid private tour. This may change a lot, especially if you go there off season.