s 17 Duration and effect of banning order
(1) A banning order must specify the length of each ban imposed by the order. (2) A ban must last at least 12 months. (3) A banning order may contain exceptions to a ban for some or all of the period to which the ban relates and the exceptions may be subject to conditions. (4) A banning order may, for example, contain exceptions— (a) to deal with cases where there are existing tenancies and the landlord does not have the power to bring them to an immediate end, or (b) to allow letting agents to wind down current business.