I can't find any statutory change reducing the time for RAF Notice as a General Right (NGR); the only 12-month wait are for some PVR waiting times.
Could be correct for the RN - like my original post said, I couln't find and RN ToSRs (insert your own line here ......).
Of course in the brave new world of JPA any single-Service variations should be standardised. Wait out.
cornishpixie, no airmen (and no doubt soldiers and marines) can exercise the right at any time after the initial qaulifying service (3 years if my memory serves me correctly). That is the main reason why there is a requirement for an airmen to waive his/her right in writing is they attend a training course that attracts a Training Return of Service.