The confusion in postal administration which naturally resulted from the struggle among the rival claimants was increased by the Civil War. In 1643 the Royal Court was moved to Oxford. The Secretaries of State acting as Postmasters-General sent James Hicks, the quondam servant of Prideaux, to collect arrears from the postmasters due to the Letter Office. In addition to collecting the money due, he was to require all postmasters on the road to Coventry to convey to and from the Court all letters and packets on His Majesty's service, to establish new stages, to forward the names of those willing to supply horses and guides, and to report those postmasters who were disobedient or disloyal.[96] During the most desperate period of the royal cause Hicks acted as special messenger for the King, and apparently had some exciting experiences in carrying the letters of his royal master. He lived to enjoy his reward when the second Charles had come to his own. Parliament, in the meantime, was establishing its control over the posts and reorganizing the service. In the early period of Parliamentary government, postal affairs were as a rule looked after by what was known as the "Committee of Both Kingdoms," and the orders which it issued were necessarily based upon political conditions. Later the Postmaster-General acted under the Council of State or under Cromwell himself. In 1644 the House of Commons issued an order that protection should be granted to the postmasters between London and Hull, to their servants, horses and goods.[97] The fact that it was necessary to re-settle posts on the old established London-Berwick road shows how demoralized conditions had been during the conflict.[98] Many of the loyal postmasters were dismissed. Their lukewarm conduct in supplying the messengers of the Commonwealth with horses produced a reprimand from the Committee and a sharp warning from Prideaux.[99] Posts were settled from London to Lyme Regis for better communication with the southwestern counties. In 1644 Edmund Prideaux was formally appointed Postmaster-General.[100] He was allowed to use as his office part of the building occupied by the Committee of Accounts, formerly the house of a London alderman.[101] As long as the war continued it was necessary that a close watch should be kept over letters passing by post. Many of the new postmasters were military men and in addition others were appointed in each town under the heading of "persons to give intelligence."[102] With the return of normal conditions after 1649 Prideaux was ordered by the Council of State to make arrangements for establishing posts all over England as in the peaceful days before the war.[103] His report of the same year to the Council of State indicates the successful fulfilment of his instructions. He said that he had established a weekly conveyance of letters to all parts of the Commonwealth and that with the receipts from private letters he had paid all the postmasters except those on the Dover road.[104]

For the safety of the Commonwealth it was often found necessary to search the letters. Sometimes the posts were stopped and all the letters examined. When this was done, it was by order of the Council of State, which appointed certain officials to go through the correspondence.[105] Sir Kenelm Digby, writing to Lord Conway from Calais, asks him to direct his letters to that place, where they would find him, "if no curious overseer of the packets at the post break them open for the superscription's sake."[106] The Commonwealth did openly and is consequently blamed for what had been done more or less secretly by the Royal Government.

In 1651 the first proposal for farming the Post Office was submitted to the Council of State. The Council reported the question to Parliament but there is no evidence as to their attitude on the question at that time.[107] The next year Parliament ordered that the question of management, whether by contract or otherwise, should be re-committed to the Council,[108] and in 1653 it was decided that it would be better to let the posts out to farm. Prideaux had been quietly dropped by the Council after making, as it was reported, a large fortune. When we remember that under his management there was an annual deficit of £600 besides the expenses of the Dover road and that in 1653 there was a net revenue of £10,000, it seems probable that there is some truth in the report. The conditions upon which the Post Office was farmed, were as follows:—

The farmers must be men of stability and good credit and must be selected from those contracting. Official letters and letters from and to members of Parliament must be carried free. All postage rates must be fixed by the Council and not changed without its consent. Finally all postmasters should be approved by the Council and Lord Protector.[109]

The policy of the Commonwealth in letting the posts out to farm had much in its favour. The evil usually resulting from farming is the temptation and the opportunity it offers for extortion from the people. But in the case of the posts no oppression was possible, for the farmer was limited in his charge to the rate fixed by the Government. More than this, private control over the post office business afforded what was most needed at the time, greater economy and stricter supervision over the deputy postmasters. It was upon the deputy postmasters alone that the farming system might exercise undue pressure, but from them there was no complaint of the withholding or reduction of wages until after Cromwell's death.[110]

John Manley was appointed "Farmer of the Posts" for two years at a yearly rent of £10,000. There were at least four higher tenders than his, and Manley contracted only for £8259. It was hinted that Manley and the Council had come to a private agreement concerning the rent to be paid.[111] In his orders to the postmasters, Manley requested them to take particular care of government packets and to see that no one was allowed to ride in post unless by special warrant. All letters should be counted by them and the number certified in London. They were to keep a sharp eye upon people, especially travellers, and report any discontent or disaffection.[112] In 1654 Manley's title of Postmaster-General was confirmed by act of Parliament, the first act dealing directly with postal affairs.[113] He was unsuccessful in having his franchise extended beyond the original two years, and by order of the Council of State the management of the Posts was entrusted to Mr. Thurloe, Secretary of State, for £10,000 a year, the same amount which Manley had paid.[114]

Shortly after Thurloe had been appointed Postmaster-General, general orders were issued by Cromwell to all the postmasters. He forbade them to send by express any letters or packets except those sent by certain officials on affairs of state, all others to await the regular time for the departure of the mails. The old regulations for providing mail-bags, registration of the time of reception, and the like were repeated. The number of mails to and from London was increased from one to three a week each way, and to ensure higher speed, each postmaster was to provide a horse ready saddled and was not to detain the mail longer than half an hour under any consideration. He was ordered to deliver all letters in the country at or near his stage and was to collect the postage marked on the letter unless it was postpaid. The money so collected was to be returned to London every three months.[115]

In 1657 the first act of Parliament was passed which fixed rates for the conveyance of letters and established the system for the British Islands. The preamble stated: "That whereas it hath been found by experience that the writing and settling of one General Post Office ... is the best means not only to maintain certain intercourse of trade and commerce betwixt all the said places to the great benefit of the people of these nations, but also to convey the public despatches and to discover and prevent many dangerous and wicked designs, which have been and are daily continued against the peace and welfare of this Commonwealth," it is enacted that there shall be one General Post Office called the Post Office of England, and one Postmaster-General nominated and appointed by the Protector for life or for a term of years not exceeding eleven.[116] In accordance with the terms of this act, Thurloe was appointed by Cromwell and continued to act as Postmaster-General until the downfall of the Commonwealth.[117]

After the Restoration most of the old claimants to the Post Office came to the front again. Stanhope besieged King and Parliament for restoration to his old place. He seems to have received some compensation, which he deserved for his pertinacity if for nothing else. The Porters were up in arms at once, for he had promised them to come to no agreement until they were satisfied.[118] The two daughters of Burlamachi pleaded for some mark of favour, on the ground that their father had ruined himself for the late King. Frizell was still very much alive, and a nephew of Witherings carried on the family feud.[119] In the meantime James Hicks was employed by the Secretary of State to ascertain how many of the old deputy postmasters were still eligible for positions. He reported that many of them were dead and that many of those who were applying for positions had been enemies of the King. For the time being it was decided that the present officials should remain in office until a settlement should be made.[120]

Henry Bishop was appointed by royal patent Postmaster-General of England for seven years at a rent of £21,500 a year. The King agreed to persuade Parliament to pass an act[121] settling the rates and terms under which Bishop was to exercise his duties. For the time being he was to charge the same rates as those in the "pretended Act of 1657," to defray all postal expenses and to carry free all public letters and letters of members of Parliament during the present session. He agreed also to allow the Secretaries to examine letters and not to change old routes or set up new without their consent. He was to dismiss all officials whom they should object to on reasonable grounds. If his income should be lessened by war or plague or if this grant should prove ineffectual, the Secretaries agreed to allow such abatement in his farm as should seem reasonable to them.[122] Bishop's régime does not seem to have been popular with the postmasters, for a petition in behalf of 300 of them, representing themselves to be "all the postmasters in England, Scotland, and Ireland," was presented to Parliament in protest against the Postmaster-General's actions. They describe how Cromwell had let the Post Office out to farm. They credit him with respecting their rights and paying their wages. Lately, however, Bishop had been appointed farmer, and unless they submitted to his orders, they were dismissed at once. He had decreased their wages by more than one half, made them pay for their places again, and demanded bonds from them that they should not disclose any of these things.[123]