THE Budget is an important part of Government operations, laying out several economic parameters for the UK.

One of the key parts of the Budget is to forecast outcomes for the economy and public finances for the next five years.

This is a service provided by the OBR, the Office for Budget Responsibility, which does it twice a year.

It accompanies the Budget Statement (usually in late November) and the Spring Statement (usually in March).

However, on Wednesday it was published early, meaning that key details from the Budget were indirectly revealed through the OBR's analysis of them .

The leak led to chaos in the Commons , with the Tories calling for a probe into the potentially "criminal" act .

What is the OBR?

The OBR is a non-departmental public body funded by the UK Treas

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