Five year check
There are a number of useful documents for the five year check.
Firstly, the refresher notes for the session - what we need to do:

Next, some useful notes on taking control:

The 2022 accident review.

For Cambridge GC instructors, familiarity with the Flight Operations Manuals is important:
Part 1:
Part 2:
Part 3:
Motorglider and SEP pilots (Excluding Aerotowing)
Part 4:
Sailplane and Motorglider Daily Inspection, Defect Reporting & Test Flying