In the middle of the english Civil War, the fighting men of the parliamentary faction ("The Levelers") met and drafted a bill of particulars as to how England should be governed. These were the men who fought the King. Cromwell was among them but not the leader at that time. Here's some of what they proposed, which in truth is well beyond our current system.
An agreement of the people for a firm and present peace upon grounds of common right and freedom. 28 October 1647"1. That the people of England being at this day very unequally distributed by counties, cities and boroughs for the election of their deputies in parliament, ought to be more indifferently proportioned according to the number of the inhabitants: the circumstances whereof, for number, place, and manner, are to be set down before the end of this present parliament. (proportional representation in Parliament)
"4. That the power of this and all future representatives of this nation is inferior only to theirs who choose them, and doth extend, without the consent or concurrence of any other person or persons, to the enacting, altering, and repealing of laws; to the erecting and abolishing of offices and courts; to the appointing, removing, and calling to account magistrates and officers of all degrees; to the making war and peace; to the treating with foreign states; and generally, to whatsoever is not expressly or impliedly reserved by the represented to themselves. Which are as follows:
1. That matters of religion and the ways of God's worship are not at all entrusted by us to any human power, because therein we cannot remit or exceed a tittle of what our consciences dictate to be the mind of God, without wilful sin. Nevertheless the public way of instructing the nation — so it be not compulsive — is referred to their discretion.
2. That the matter of impressing and constraining any of us to serve in the wars is against our freedom; and therefore we do not allow it in our representatives; the rather, because money (the sinews of war) being always at their disposal, they can never want numbers of men apt enough to engage in any just cause.
3. That after the dissolution of this present parliament, no person be at any time questioned for anything said or done in reference to the late public differences, otherwise than in execution of the judgements of the present representatives (or House of Commons).
4. That in all laws made or to be made, every person may be bound alike; and that no tenure, estate, charter, degree, birth, or place do confer any exemption from the ordinary course of legal proceedings whereunto others are subjected.
5. That as the laws ought to be equal, so they must be good and not evidently destructive to the safety and well-being of the people."