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

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.