Indeed. My rating expires again in November this year and Im going to the On-Track seminar in Feb 2007 at Sywell.
The thing about these seminars are they also have group work - you need a reasonable number of instructors to make it meaningful - and given the number of people involved in the seminar (The On-Track one has at least 10 people included in the presentations) it would be difficult to run these things on a smaller basis.
The good thing about the On-Track seminars though is these guys are FIEs and therefore you can get your ticket signed up there and then at the seminar.
If anyone else is going to the On-Track one in Feb let me know - we can meet up for a bevvy in the bar!!