Is it acceptable to use a third party lab’s available pharmacopeial reference standard to qualify an establishment’s secondary standard?

This practice is acceptable providing the contract testing lab has an Establishment Licence (EL) and has
been audited by the client to demonstrate its capability to qualify the secondary standard (i.e., the official
standard and the proper equipment is available on the tester’s premises, the method used has been validated,
etc.). Transfer of the standard between the sites should be under controlled conditions.