Actually… looking at the page in a bit more depth… I really hope it's not Dunc's club… there are some rather iffy occurrences across the site.
We can start on the linked page… there is some katakana on the side, which is used in Japanese to write out foreign words… but reading it out seems a bit… odd. It reads: (right column, should be read first) タイミング, which is read "Taimingu" (timing), (left column) デイスタンス, which reads "Deisutansu" (days and?)… so it's written backwards… and not particularly well… to mean "days and times". Okay, that might just seem nitpicking… and it might be… so let's continue.
The "Classes and Formats" page, under the description of "So what are the classes like?" talks about a lack of formality, likening such things to "egotistical hierarch(ies)"… uh, no… it would actually make it like traditional Japanese martial arts… of course, this is just the way the classes are run, and such approaches certainly have their place… but the seeming disdain for all the cultural Japanese elements to a supposedly "traditional Japanese martial art" school I find a little… disconcerting.
We could then look at the "The Art" page… which has a number of rather dubious ideas put forth, and some rather ignorant sweeping generalisations and assumptions (the descriptions of other organisations and other martial arts are particularly troubling)… but let's look at some simply incorrect information. Under the heading "Different Styles of Samurai Martial Arts (Jujutsu or Bujutsu)", there are a couple of paragraphs of related systems to those found in the Bujinkan, specifically Kukishinden Ryu and Takagi Yoshin Ryu. The Kukishin material is wrong on a number of issues, but the other is worse. Instead of naming the system as Takagi Ryu, it instead constantly references it as "Yoshin Ryu". Nope, wrong, sorry, completely different art.
Each of the systems that are cited (Hontai Yoshin Ryu, although they incorrectly cite the previous head, Inoue Munenori, who passed a number of years ago, rather than his son and successor, Inoue Kyoichi, and Moto-ha Yoshin Ryu, which is a modern branch of the Hontai Yoshin Ryu founded by a Menkyo holder in the 80's, Yasumoto Akiyoshi), although not featuring the "Takagi" portion to their name anymore, are part of the Takagi Ryu line of systems… the Yoshin Ryu line is completely different, sometimes referred to as the Akiyama Yoshin Ryu, and is no longer extant, although there are a number of systems that trace themselves back to that art, such as Shindo Yoshin Ryu, Tenjin Shin'yo Ryu, and Yoshin Ryu Naginata. But the point is that, despite the similar name, there is absolutely no connection between the Takagi systems and the Yoshin Ryu lines… so that's a major fail in simply knowing their own art.
I'm also with Tony in that the lack of a name for the instructor is something I find a little worrying… what we can figure out is that they are at least Judan, as there's a Judan patch on the site, and there is reference to the instructor having "inadvertently accumulated all the bling, badges & grades along the way" (an interesting way to say that the grade, although coming from the head of the system, isn't something to be proud of earning…), but that's about it. Couple that with the "we're more serious than anyone else" style comments ("as this is a real martial art…"), and I really, really hope this isn't Dunc's site. If it is… it really needs to be done over, as this is the site of someone who exemplifies all the issues with the organisation (large rank, lack of belief of personal ability/earning of the grade, tacit acceptance of low quality, lack of any real knowledge or understanding, lack of awareness of a range of realities, lack of awareness of the traits of Japanese arts, a desire to be doing something more than others without actually recognising what the reality is, and so on). The more I read, the less I would recommend even contacting them.