13Regulations may make provision with respect to the labelling or marking of gaming machines provided on any premises in respect of which a gaming machine licence is for the time being in force, with a view to enabling such machines to be identified as chargeable at the lower rate, the higher rate, the peak rate or, as the case may be, as being penny machines; and any such regulations may include provision as to the size and description of labels or marks to be applied to machines, as to the cases in which they are required to be, or are prohibited from being, applied, and as to the manner of their application.