5.—(1) 2 households may agree to be treated as an extended household for the purposes of regulation 4 or 6(2)(b).
(2) To agree to be treated as an extended household, all of the adults of the 2 households must agree.
(3) A household may only agree to be treated as being in 1 extended household.
(4) A household ceases to be treated as being in an extended household if any adults in the household ceases to agree to be treated as being in the extended household.
(5) If a household ceases to be treated as being in an extended household, the household may not agree to be treated as being in an extended household with any other household.