There have been almost no Budget leaks.
The chancellor's aides are using intelligence-style security measures to guard its secrets: the Budget has been split into "compartments" with very few given access to all of them. There are codenames. The IT has been locked down and ministers viewing the plans have to sign a digital promise not to brief media.
Such security is a response to the feeling that speculation around the last Budget, sometimes informed by insiders, was economically destabilising.
