The British constitution relies on conventions, in this case something called the Salisbury convention.
Unlike the Gunpowder Plot, Mr Blair's attempt to rearrange the British constitution cannot be given a single neat date.
Imagine what the British constitution would look like if the principle of cabinet government were to be further weakened.
Nor is Mr Blair's government truly changing the fundamentals of the British constitution.
Along with the cabinet changes, late on a Thursday afternoon and without any warning, Mr Blair decided to rearrange the British constitution.
Having opened this Pandora's box, it will have to confront, probably sooner rather than later, the muddle at the very heart of the British constitution.
Some experts think that using an Act to amend its own terms is unsporting, though, as ever with the British constitution, no one really knows.
Indeed, the infinitely small British constitution ranks highest by this standard.
The unwritten British constitution in this situation allows for the incumbent party, in this case, the Labour Party, led by Prime Minister Gordon Brown to seek a coalition deal.
And yet Mr Blair, with his parliamentary majority of 176, is setting off a bigger bang under the British constitution than Guy Fawkes ever contrived with all his sacks of gunpowder.
Despite his failure ever to meet Gladstone, Mr Bognador draws heavily on the Old Man's philosophy to argue that Tony Blair's recent transformation of the British constitution is more likely to strengthen the union than to break it apart.
So, continental Europe, with your written constitutional cultures, give a welcome to British proposals for a European constitution but do not forget the very British constitutional culture behind it.
And Mr Blair feels that if British voters read the constitution, they can be brought round to supporting it.
Both wrote seminal books on British politics and the constitution.
Two years ago, the British were reluctant to accept that the charter should be in the constitution, because it was alien to British legal traditions and might be used to overturn Thatcher-era labour-market reforms.
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EU's new member countries to persuade British voters to vote against the constitution.
British Eurosceptics fear that the draft constitution would allow Brussels to impose continental-style labour-market restrictions on Britain, thereby importing continental-style high unemployment.
This has increased the sense that a constitution that places the British monarch at its centre no longer reflects the realities of modern Australia.
He won't even commit to giving the British people a say over the EU constitution.
When pollsters ask the British what they worry about, the constitution comes a long way behind health, crime or the economy.
The British people are so little fascinated by the constitution that they never bothered to write one down.
This, say the Liberals, in effect amends the federal constitution, and so, under British Columbia's law, requires a referendum there.
In other capitals, there is special rancour that the British secured hefty opt-outs from the constitution and came back for more in the Lisbon treaty and still grumble about the results.
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The British government explains this by referring to the American constitution, which protects American citizens from being extradited on the mere say-so of a foreign government.
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The British suggested that it should be made clear that the constitution's Charter of Fundamental Rights would not limit the rights of managers to sack workers.
This shrewd New Democrat played a big part in getting Canada's constitution brought under overtly Canadian (rather than, theoretically, British) control in 1982.
He was broadly backed by new British Conservative MEP Anthea McIntyre who said that any evaluation of the Hungarian constitution should be carried out "with fairness and balance".
The ignominious defeat of Jemini (pictured above), the singing duo that represented Britain in the Eurovision contest, enraged the Europhobic British press, which reacted by stepping up its campaign against the new constitution.
Without a limiting Constitution, dramatic changes can occur in the wake of any one British election.
Fianna Fail's Eamon De Valera, whose 1937 constitution created the presidency, took part in the 1916 Easter Rising against the British but as prime minister he was also responsible for the execution of IRA members who endangered the new Irish state.
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