7In this Case and in Case II below " the housing authority concerned " means—
(a)where the dwelling-house of which vacant possession is required is in a London borough, the council of that borough or the Greater London Council if they have agreed with them to discharge their functions under the [1976 c. 80.] Rent (Agriculture) Act 1976 ;
(b)in the Isles of Scilly, the Council of those Isles ;
(c)in any other area, the local authority having functions under Part V of the Housing Act 1957 in relation to that area.