And be it further enacted by the Authority aforesaid That none of the said Master Printers to be allowed from time to time as aforesaid shall keep above Two Printing Presses at once unlesse he hath been Master or Upper Warden of the Company who are hereby allowed to keepe Three Presses and no more unlesse for some great and special occasion for the Publique he or they have for a time leave of the said Lord Archbishop of Canterbury or Lord Bishop of London for the time being to have or use one or more above the aforesaid. Number as theire Lordships or either of them shall thinke fit