The number plate 1D was bought for a record £352,000 at auction yesterday.
Tycoon Nabil Bishara won it in fierce bidding and plans to put it on his wife's Bentley.
His £352,411 offer beats the previous £254,000 best for a DVLA sale, set by 51NGH in 2006. The DVLA's Damian Lawson said after the auction in Claverdon, Warks: "We're absolutely over the moon."
Britain's priciest car reg is F1, bought privately for £440,625 in 2008 by Afzal Kahn of Bradford, West Yorks.
The world's top price was £7million to buy the plate 1 in the United Arab Emirates.