In 1635 Witherings proposed to Charles's Council to "settle a pacquet post between London and all parts of His Majesty's dominions, for the carrying and recarrying of his subjects letters" To justify the expenditure Witherings included an argument that ''"anie fight at sea, anie distress of His Majestie's ships (which God forbid), anie wrong offered by anie nation to anie of ye coastes of England or anie of His Majestie's forts…the newes will come sooner than thought''. In 1635 a state letter monopoly formally came into being and the public institution of the
Post Office was created. It was used to raise revenues to sponsor state activities including war. The King's proclamation dated at Bagshot on 31 July 1635 which established the letter-office required Witherings to "settle a running post or two to run day and night between
Edinburgh and Scotland and the City of London, to go thither and come back in six days". Under Witherings' organisation a public postal service was established with post offices connected by regular routes established, throughout the country, along the lines of communication used by the Tudor armies. Witherings opened the first post office at Bishopsgate Street in October 1635. The King charged Witherings with building six "Great Roads" to aid in the delivery of the post, of which the Great West Road was one. Postmasters on each road were required to provide horses for the mail at 2½d a mile ==Parliamentary career and sequestration of his posts==