RN Historic Flight gets an annual standards check by the RN fixed wing trappers primarily in the Chipmunk (for the Sea Fury and Swordfish pilots; Sea Hawk pilots are Hawk current.)
Trappers are all outside the RNHF organisation to ensure objectivity.
With only around 25 hours per pilot during the season and all pilots having other day jobs, it's crucial that an external look at S&P is carried out each year.