5.—(1) Section 6 shall apply in accordance with this regulation as respects functional work of any description if carried out by an authority named in Schedule I hereto.
(2) In the case of work falling within a defined activity mentioned in column 1 of Schedule 2, section 6 shall apply if the work is carried out by a non metropolitan district council on or after the date specified in that Schedule in relation to that activity and to the group in Schedule 1 in which the council in question is included.
(3) In the case of work falling within a defined activity mentioned in column 1 of Schedule 3, section 6 shall apply if the work is carried out by a county council on or after the date specified in that Schedule in relation to that activity and to the group in Schedule 1 in which the council in question is included.
(4) In the case of work falling within a defined activity mentioned in column 1 of Schedule 4, section 6 shall apply if the work is carried out by a London borough or metropolitan district council on or after the date specified in that Schedule in relation to that activity and to the group in Schedule 1 in which the council in question is included.
(5) This regulation shall apply—
(a)to a county police authority as if it were a member of the same numbered group as the county council for its area; and
(b)to the Common Council of the City of London (whether in its capacity as local authority or police authority) as if it were a London borough council in the group numbered 1.