Mel Stride has admitted the state pension triple lock is "not sustainable" in the long run.

The Work and Pensions Secretary insisted the Tories stay dedicated to the promise till the following basic election.

But he forged doubt over the way forward for the coverage - which sees state pensions improve annually by the very best out of earnings, value rises or 2.5 % - past that time.

His feedback come after new earnings figures indicated that funds may go up by 8.5 % subsequent April.

Mr Stride instructed BBC Radio 4's World At One: "This argument has been around for a long time, and understandably so because the Office for Budget Responsibility, the main independent forecaster, comes forward with the fiscal sustainability report on an annual basis.

"And it casts out 50 years, and it seems to be on the impression of the rise within the state pension on the triple lock, amongst different points, and what that does to the father or mother funds.

"So we've known for a long time, that in the very, very long term, you're absolutely right, it is not sustainable.

"But after all, what I'm coping with is now and the place we stand in the mean time, is we stay dedicated to the triple lock. And that is the trail that we are going to be taking.

"But as to the future, and after future general elections, and so on and so forth, who knows. But that's the position we're in at present."

Mr Stride refused to verify that the determine for common earnings together with bonuses could be used below the triple-lock components.

He stated: "There clearly is a difference if you take into account the non-consolidated elements of pay in recent times, but these are all decisions that I have to take with the Chancellor as part of a very clear process, a statutory process actually, that I go through in the autumn.

"So I did not need me to get into the weeds of precisely how I'm going to go about that. But the overarching level concerning the triple lock is that we stay dedicated to it."

Put to him that he was not ruling out using a lower figure based on earnings without bonuses, around 7.8 percent, he said: "I'm not going to get drawn into these sorts of questions."

The Department for Work and Pensions (DWP) said on Tuesday that the Government is committed to the triple lock and a statutory annual review of benefits and state pensions will take place in the autumn.

Downing Street would not confirm whether the 8.5 percent figure will be applied, insisting it cannot get ahead of the "formal course of" for uprating which takes place later in the year.

The Prime Minister's official spokesman said: "We stay dedicated to the triple lock and we'll be sure that the state pension stays sustainable and truthful throughout generations whereas offering safety and dignity in retirement for hundreds of thousands of individuals throughout the nation."

The triple lock was launched by the Conservative-led coalition authorities in 2010 as a manner of making certain pensioner earnings didn't lose worth in actual phrases.