This slipped under my radar, but thanks to @RichGreenhill on twitter for pointing to Section 7 of The Openness of Local Government Bodies Regulations 2014, in force as of 6 August 2014.
Section 7 provides:
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7. (1) The decision-making officer must produce a written record of any decision which falls within paragraph (2).
(2) A decision falls within this paragraph if it would otherwise have been taken by the relevant local government body, or a committee, sub-committee of that body or a joint committee in which that body participates, but it has been delegated to an officer of that body either—
(a) under a specific express authorisation; or