Section 37 of the Freedom of Information Act provides that:
Information is exempt information if it relates to -
(a) communications with Her Majesty, with other members of the Royal
Family or with the Royal Household, or
(b) the conferring by the Crown of any honour or dignity.
The duty to confirm or deny does not arise in relation to information
which is (or if it were held by the public authority would be) exempt
information by virtue of subsection (1).
Section 37 falls into two quite distinct parts:
information relating to communications with Her Majesty with other
members of the Royal Family or with the Royal Household, and
information relating to the conferring by the Crown of any honour
or dignity
For convenience these are discussed in two separate parts of this section.