A powerful group of cross-party MPs has demanded the chancellor release a full economic forecast by the end of October – a month earlier than planned.

The Treasury Select Committee, made up of MPs from all parties and chaired by a Conservative MP, has called on Kwasi Kwarteng to release a full economic forecast from the independent Office for Budget Responsibility (OBR) by the end of October.

Mr Kwarteng had said it would be released on 23 November, when he is due to give his next budget statement – a medium-term fiscal plan.

But after last Friday’s mini-budget caused economic turmoil for the UK, the committee discovered the chancellor will be getting an initial OBR forecast on 7 October.

They have also requested the full budget be brought forward to the end of October as well.

And they have asked him to publish “without delay” the initial economic and fiscal forecast the OBR provided to him when he started the job a few weeks ago.

The letter from the committee’s Tory chair, Mel Stride, said it is “hard to conclude other than that an absence of a forecast has in some part driven the lack of confidence in markets”.

He added: “Some have formed the unfortunate impression that the government may be seeking to avoid scrutiny, possibly on account of expecting the OBR forecast to be unsupportive of the achievement of the economic outcomes the government expects from the Growth Plan, including 2.5% trend growth in the medium term.”

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