18. For the purposes of regulations 15(4), 16(4) and 17(4) the relevant valuation band or Flood Re category for relevant household premises is—
(a)in a case within paragraph (a) of the definition of “household premises”, the valuation band or Flood Re category applicable to the dwelling; and
(b)in a case within paragraph (b) of that definition, the valuation band or Flood Re category applicable to the residential unit occupied by the holder of the combined policy, buildings policy or contents policy for the household premises.