apologies for the long post but...
Okay, so I looked into Mr. Allen's Tai Chi qualifications, with regards to being a 5th Degree Master of Tai Chi under Shihan Jon Alexander (9th Degree) and a registered instructor with the 'Alexander Tai Chi Foundation and National Council for Oriental Martial Arts'.
I discovered this cached version of a page from zenshinbudokai.co.uk:
(screencap included below as the Google cache is transitory)
I would appear that Mr. Alexander offers intensive, 'fast-track' courses in various arts, such as KATANA, GOJU KARATE, BOJU, SAI, KYUDO, TAI-CHI-CHUAN, WING-CHUN, KICKBOXING, FREE STYLE KARATE, FILIPINO ARTS and TAI-CHI SWORD.
Note the blurb:
This is another, older site associated with Mr. Alexander, pulled from the Internet Archive, which makes much the same claims:
Originally Posted by the above site
Screenie (from 2008):
Though I'm sceptical that one can really become proficient enough to instruct any MA from a intensive, fast track, 1-4 day course, I have no proof whatsoever that Mr. Allen obtained his qualifications in this manner and is not, in fact a long-term student of Mr. Alexander who has indeed 'worked his butt off' for years to learn his chosen art.
I do note, however that on the archived copy of the martial-arts-teacher-training.co.uk site from 2008, Mr. Allen is listed in Mr. Alexander's own black belt registry as holding Tai Chi Chuan - 1st Degree at that point in time.
(screencap with Mr Allen's entry highlighted)
First degree to 5th degree (plus a '6th Degree in Oriental Martial Arts', also awarded by Jon Alexander) in two years or so seems rather quick to me, assuming that the 2008 website was up to date - but that's merely my non-expert opinion, based on what I have in front of me at present.