Shadow Treasury Minister Chris Leslie told ITV News that the Bank of England's new Funding for Lending Scheme did not give much "confidence" in the economy, after the Chancellor set up the £80 billion initiative to kick-start lending.
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Charities warn that sitting down too long can lead to health risks such as type 2 diabetes and cardiovascular disease.
The Labour leader will use a speech to set out the differences between his party and the Conservatives with particular emphasis on the NHS.
Kate will join Prince William on a tour of the Stephen Lawrence Centre before visiting a charity working with disadvantaged young people.