For legislation to be lawfully enacted a proposed Bill must be voted on and requires the consent of the Commons before it becomes an Act of Parliament. This is an ancient principle and is a fundamental principle of our English constitution.
The House of Commons consists of parliamentarians elected by ordinary commoners. Those elected are our representatives in Parliament and in that role their job is to settle grievances, but more importantly, it is to represent our consent to enact legislation.
We are governed by our consent and we vote for a representative and entrust that representative with that consent. It is only our consent via our vote that enables our representatives to vote on prospective legislation, there is no other lawful authority which gives them this great power. We are the highest authority in this regard.
If there was ever a great secret that they were keeping from us, then this is it.
Parliament are not sovereign and cannot lawfully create whatever legislation suits them regardless of the consequences to the People that they were chosen to represent. The reason being is that they need our consent to be chosen as representatives and if nobody votes for them they don’t go to parliament. They have to be chosen. More about this later.
Over the years many people have come to realise that the politicians in Parliament are now self serving and do not represent the Will of the People. No further comment on this is required.
The fact is that the majority of those people have chosen not to vote, so consequentially the turnouts at elections is generally very poor. This means that if for example there is a 60% turnout, 40% of English peoples Will is not represented in Parliament and they have not consented to future legislation being enacted. They have not taken part in the legislative process, which is the constitutional Right of all Englishmen. What they have essentially done is abstained from voting, thus accepting by their lack of performance any and all legislation that is enacted by their absence in the electoral process. We are governed by a minority chosen by a minority of the total electorate, which is easier to manipulate by those that will do so.
But, whether they know it or not, these “non-voters” hold the majority power because the 60% is divided between all of those standing for election and it is unlikely that 40% of those votes would go to one person or party. The non-voters are the only people that have the ability to topple the current regime and restore the English peoples Constitution to the state that it was originally intended.
The fundamental principle to remember here is that by law, ALL ballots must be counted and recorded, INCLUDING SPOILT BALLOTS.
By taking part in the electoral process you are exercising a constitutional Right and by spoiling your ballot with the words ‘SPOILT BALLOT, I DO NOT CONSENT’, you are officially and legitimately withdrawing the consent needed for legislation that affects you from being lawfully consented to in the voting process by those in Parliament.
As stated earlier Parliament is not sovereign, the People are, and if a parliament does not have the consent of the majority of the commoners (us), they cannot lawfully nor constitutionally enact or enforce any legislation binding on us.
It is this constitutional principle that is designed to keep us free from the arbitrary Will of tyranny.
So to conclude, the majority are the non-voters but by not voting are not taking part in the electoral process and so cannot effect any change. They are at the mercy of the regime and bound by the laws that they create. By law the regime DO need the consent of the majority to enact and enforce legislation, which is given when voting for a representative at elections. By law all ballots must be counted and recorded.
England belongs to all of the People, not the minority under the authority of usurped power. We are self governing by consent. It is this principle that is intended to keep us a free people.
SPOILT BALLOT, I DO NOT CONSENT.
The Secret People 
I’ve been advocating a vote of ‘none of these bastards’ for decades.
Well the regime are not going to put that on the ballot paper for obvious reasons, but CLEARLY spoiling your ballot “SPOILT BALLOT” and the reason for spoiling it “I DO NOT CONSENT” then taking a photo of it as evidence is a legitimate and lawful process which the regime cannot stop and cannot ignore.
When the spoilt ballots outnumber the “winning party” there can be no legitimate governance, causing a constitutional crisis. Then we take it from there.
I doubt there is any chance of having any kind of abstention added. However, your suggestion of ‘I DO NOT CONSENT’ and a photo. is even better. It says more and will do nicely until the invocation of Article 61 of Magna Carta can be enforced.