An authorised officer may serve an improvement notice on the occupier of premises at which there is a regulated system or a public swimming pool or spa pool or premises at which a person carries out skin penetration procedures if the officer believes, on reasonable grounds, that--
(a) the premises, or a regulated system, public swimming pool or spa pool at those premises, does not comply with an enforceable requirement, or
(b) a regulated system, public swimming pool or spa pool at the premises is not being maintained or operated in accordance with an enforceable requirement.