//^ In which case the NDORS administrators should update their website to include details of courses available in Dorset.//
The NDORS website is correct. Dorset police do offer courses but they do not participate in the national scheme, This means if you are caught speeding in Dorset and are offered a course, you can only take that course in Dorset. Conversely if you are caught elsewhere and are offered a course you cannot take it in Dorset.
This has its advantages. Courses taken in Dorset do not count for the national "three year" rule. Similarly courses taken elsewhere do not count if you are caught in Dorset. So you get an extra "life" if one of your offences is committed in Dorset.
//... a young lad on the course showed us his paperwork, 31 in a 30 limit.//
I've heard this before, Vulcan (I think, from you). I can only say that all Forces are committed to abiding by the NPCC's guidelines of not taking action below 10% + 2. In fact one or two (I can't recall which ones) do not take action below 10% + 3.