Sch 4 para 10 Warning notices
Before it requires the payment of a penalty by the operator under paragraph 9 the Regulator must— (a) give the operator a notice in writing (a “warning notice”); (b) give the operator at least 21 days to make representations; (c) consider any representations made; and (d) as soon as is reasonably practicable, give the operator a notice in writing stating whether or not it intends to impose the penalty, and where a penalty is to be imposed, the amount of the penalty.