Free Traffic Legal Advice

Am I right in thinking that there aren't really any technicalities that can be appealed on (e.g. camera authorisation...etc)?

There is no 'appeal' process (until convicted).  A defence is required to defend a speeding allegation at court.

Assuming the appropriate traffic order is in place and the measurement is correct (which it is assumed to be) then taking a course is likely to be the best way to dispose of the matter.