Andy Haldane said the tax system should be tilted to boost incentives for more cash to flow into British companies.

When asked if Burnham would rule out exit taxes, a spokesperson said they would not comment on speculation or write policy “off the cuff”.

As he prepares to enter Downing Street, Mr Burnham is reported to be looking at the rates of capital gains tax, which is levied on the profit made when selling an asset.

An economic advisor to Burnham has hinted he may consider setting different income tax rates across England

Andy Haldane said the tax system should be tilted to boost incentives for more cash to flow into British companies.