This all seems to be a right "guddle". In the introduction to IN 2015/034 it says that the amendment to the Aircrew Regulation has introduced a means to allow instructors to be specifically authorised to extend the validity of Single Engine Piston (SEP) and Touring Motor Glider (TMG) ratings when the holder complies with the requirements for "revalidation by experience".
Given that the "training flight" can take place at any time within the last 12 months prior to the expiry of the rating, and before the 12 hours flying are completed, the right of instructors to extend the validity of the rating, if the views being put forward about it only being authorised immediately after the "training flight" are indeed correct, is virtually worthless. Will the CAA refund my £53?
It will not be any easier for most pilots to have the validity of their rating extended because they are still going to have to find an Examiner to complete the paperwork rather than a much more readily available instructor. For everyone's sake the CAA must clarify the position quickly.