6.18 Section 11(5) of the 1968 Act allows an individual, without holding a shotgun certificate, to borrow a shotgun from the occupier of private premises and use it on those premises in the occupier’s presence. Section 11(5) was amended by SI 2010/1759, to add that where the borrower is under eighteen, the exemption only applies if the occupier is eighteen or over. The presence of the occupier is normally taken to mean within sight and earshot of the individual borrowing the shotgun. The term "occupier" is not defined in the Firearms Acts, nor has a court clarified its meaning. However, the Firearms Consultative Committee in their 5th Annual report recommended that the provisions of section 27 of the Wildlife and Countryside Act 1981 be adopted. This states that "occupier" in relation to any land, other than the foreshore, includes any person having any right of hunting, shooting, fishing or taking game or fish.
6.19 In the absence of any firm definition for firearms purposes, it is suggested that this definition of "occupier" should be used. On some occasions though, where the status of a certificate holder acting as an occupier is an issue, the chief officer may need to consider seeking the advice of counsel. Section 57(4) provides that "premises" shall include any land. The borrower may be of any age but an offence may be committed under section 22(3) if a minor under the age of 15 is not supervised by a person over 21 years of age.
So as you can see the officers questions do not cover section 6.18, hence why he is wrong!
The OP had permission hence he was the occupier!
The flo didn't ask this!