The purpose of the series of speeches I have given over the past year has been deliberately reflective: to get beyond the immediate headlines on issues of the day and contemplate in a broader perspective, the effect of a changing world on the issues of the future. This speech on the challenge of the changing nature of communication on politics and the media is from the same perspective.

I need to say some preliminaries at the outset. This is not my response to the latest whacking from bits of the media. It is not a whinge about how unfair it all is. As I always say, it's an immense privilege to do this job and if the worst that happens is harsh media coverage, it's a small price to pay. And anyway, like it or not, I have won 3 elections and am still standing as I leave office. This speech is not a complaint. It is an argument.

As a result of being at the top of the greasy pole for thirteen years, ten of them as Prime Minister, my life, my work as Prime Minister, and its interaction with the world of communication has given me pretty deep experience, for better or worse.

A free media is a vital part of a free society. You only need to look at where such a free media is absent to know this truth. But it is also part of freedom to be able to comment on the media. It has a complete right to be free. I, like anyone else, have a complete right to speak.

My principal reflection is not about "blaming" anyone. It is that the relationship between politics, public life and the media is changing as a result of the changing context of communication in which we all operate; no-one is at fault - it is a fact; but it is my view that the effect of this change is seriously adverse to the way public life is conducted; and that we need, at the least, a proper and considered debate about how we manage the future, in which it is in all our interests that the public is properly and accurately informed. They are the priority and they are not well served by the current state of affairs.

In the analysis I am about to make, I first acknowledge my own complicity. We paid inordinate attention in the early days of New Labour to courting, assuaging, and persuading the media. In our own defence, after 18 years of Opposition and the, at times, ferocious hostility of parts of the media, it was hard to see any alternative. But such an attitude ran the risk of fuelling the trends in communications that I am about to question.

It is also hard for the public to know the facts, even when subject to the most minute scrutiny, if those facts arise out of issues of profound controversy, as the Hutton Inquiry showed.

I would only point out that the Hutton Inquiry (along with 3 other inquiries) was a six month investigation in which I as Prime Minister and other senior Ministers and officials faced unprecedented public questioning and scrutiny. The verdict was disparaged because it was not the one the critics wanted. But it was an example of being held to account, not avoiding it. But leave that to one side.

And incidentally in none of this, do I ignore the fact that this relationship has always been fraught. From Stanley Baldwin's statement about "power without responsibility being the prerogative of the harlot through the ages" back to the often extraordinarily brutal treatment meted out to Gladstone and Disraeli through to Harold Wilson's complaints of the 60s, the relations between politics and the media are and are by necessity, difficult. It's as it should be.

The question is: is it qualitatively and quantitively different today? I think yes. So that's my starting point.

Why? Because the objective circumstances in which the world of communications operate today are radically altered.

The media world - like everything else - is becoming more fragmented, more diverse and transformed by technology. The main BBC and ITN bulletins used to have audiences of 8, even 10 million. Today the average is half that. At the same time, there are rolling 24 hour news programmes that cover events as they unfold. In 1982, there were 3 TV stations broadcasting in the UK. Today there are hundreds. In 1995 225 TV shows had audiences of over 15 million. Today it is almost none.

Times Recommends

• Fern Britton: 'I still can't see that I was wrong'
• Extreme cooking
• Easy French: Tarte Tatin