where and what is wudang?

After joining this club I had started to grow concerned that I was learning a small family style. The book I got (see below) states that the wudang style was created by the author and was his form. This is a little worrying as if anything happens where my current teacher is unavailable I won't complete learning this form. I figured I would try to find out a little more and a google search later pointed me to a few interesting sites. In particular taichichuan.co.uk is an excellent resource and has some interesting discussions on the tai chi classics (a series of texts concerning the practice of tai chi) - neat site. Looks like there are plenty of instructors nationwide and around london so my concern is eased.