In practice: the stricter one
If legislation requires an annual drill and the standard you adopted requires one every six months, you do it every six months. Applying the stricter meets both and removes the need to do the work twice.
In the record: two lines
Even with a single practice, the register keeps two lines:
- the requirement from legislation — mandatory, cannot be dropped,
- the requirement from the standard — voluntary, falls away if the certificate is dropped.
Collapsing them leaves it unclear what remains on the day the certificate goes.
Which is stricter is not always obvious
Sometimes one increases frequency and the other increases scope. Then both are met — “we follow the standard” cannot justify missing a different aspect of the law.
Contract as a third source
Requirements from a contract follow the same logic and get their own line: they fall away when the contract ends, and they bind — and get asked about at audit — for as long as it runs.
The source column
This is why one of the most useful columns in a register is source: mandatory · adopted · contractual. A single three-valued field makes every question above answerable.