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)

Jon Cherry is a Director of leading personalised number plate dealer Regplates.com. Jon has over 25 years industry experience handling some of the most expensive plates ever sold with many high profile and celebrity clients. Active since 1991 in the number plate industry, Jon is currently Chairman of the Cherished Numbers Guild, a trade body representing number plate dealers in the UK. Jon has written many articles on the industry and insight into the future of numberplates and the market as a whole.