Actually, to be accurate it's £1,226,000,000* on adverts in the national and motoring press to promote awareness of the changes it has made to the Road Tax forms from the old V5 to the V5C. Somehow this is going to be paid for out of a forecasted total budget of £12,900,000.
If you're wondering where I got the figures from have a look at this release under the Freedom of Information Act. It's very clear, in the table at the top of page 3. Spend in £K is to be £1,226,000.
* Dangerous things typos, imagine if it happened in the Budget!