A person who wilfully obstructs any person acting in the execution of this Act or any byelaw or order made under it is, in any case for which no other provision is made by this Act, guilty of an offence and liable to a fine not exceeding F1level 1 on the standard scale; and if the offence is continued after conviction, he is guilty of a further offence and liable to a fine not exceeding £5 for each day on which the offence is so continued.