In the case of any market or fair held in pursuance of any statute, royal licence, royal charter or letters patent, or as of right from time immemorial, nothing in this Part of this Act shall affect the sale or exposure or offer for sale of goods in any such market or fair by any person who has paid a toll to, or is acting under the written authority of, a person holding or entitled to hold such market or fair or entitled to receive tolls in respect of sales made or stalls or stands occupied in such market or fair.