The truth about this “leak” is that it wasn’t leaked.
As reported on the BBC a number of people (32) correctly guessed the URL for the not yet released files - between 11.30 am and 12.08 on the day of the budget
This weakness was pre existing on the OBR systems
Fingers crossed the head of...
Down load a copy and you’ll see the long list of contributors
What always makes me chuckle is that Napit are named but their “code breakers” guide differs