Two distinctive car registration plates have been auctioned for a total of more than £320,000.
The plate 1 O sold for £210,242, the fourth highest price paid to the Driver and Vehicle Licensing Agency.
This fell short of expectations that it would beat the DVLA record of £254,000, set in 2006 for 51 NGH (Singh).
The registration 1 HRH fetched £113,815 on Thursday, as part of the DVLA auction of 1,600 plates at Whittlebury Hall hotel, Northamptonshire.
"The value of a number plate is increased the fewer letters and digits it has because it makes it rarer," said a DVLA spokesman.
He said that the 1 O plate was "about as rare as it gets".
The agency set its highest ever reserve price for the plate, of £10,000.
The Berkshire-based businessman who bought the regal-sounding 1 HRH said that he had been "determined to keep it in British hands".
DVLA number plate auctions have raised more than £1.3bn for the Treasury since their introduction in 1989.
The second highest price was £247,000 paid last year by retired Surrey-based businessman Rob Harverson for the 1 RH plate.
People can buy an individual plate from DVLA Personalised Registrations at any time and there are just over 30 million registrations currently available.
It also holds about six auctions a year, which feature distinctive dateless, current and older-style registrations.
Private sales of personalised number plates have raised higher prices, with the registration F1 selling for more than £400,000 last year.
TOP 10 DVLA SELLERS
51 NGH = £254,000 (2006)
1 RH = £247,000 (2008)
K1 NGS = £231,000 (1993)
1 O = £210,242 (2009)
1 A = £200,000 (1989)
1 OO = £197,000 (2006)
6 B = £130,000 (2008)
1 HRH = £113,815 (2009)
S1 NGH = £108,000 (1998)
1 RR = £106,000 (1995)