THE CFI ENDORSEMENT
This is a mandatory endorsement for the Instructor at a club who is responsible for flying standards where any flight training takes place.
At clubs where the club has formally notified the BGA that no flight training takes
place and where no flying takes place by pilots with a lower qualification than a
bronze badge with cross country endorsement, a non-instructor BGA endorsed senior
pilot may be appointed to be responsible for flying standards.
If the Club does not give pre-solo (ab-initio) instruction then there is provision for a Restricted CFI Endorsement. Restricted CFI Endorsement Requirements:
- Previously have held a BGA Instructor Rating
- Have 20 hours flying in gliders in the preceding 12 months
- Be in current cross-country practice.
Above from BGA Laws & Rules.