Been having a mooch through the archives for information on some of the plates that have been spotted in this thread. Here's some details for a few of them:
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H 1
1964 - Was owned by Roderick McLeod, an Australian engineer living in London N1, who managed to acquire both the plate and the car it was on for less than £5. McLeod had it on a bespoke Bentley coupé, which had been built to his own design by coachbuilders HJ Mulliner Park Ward. Incidentally, H 1 was originally issued in 1903 to Herbert Nield (later Sir Herbert) who, following his election to parliament in 1906, was responsible for introducing the bill that allowed registration transfers for £5.
1972 - Mr McLeod had moved to Stanmore Common, and the plate was on what looks like a Rolls-Royce Silver Shadow.
1988 - The owner is listed as Mrs S McLeod, still living in Stanmore Common.
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L 1
For many years, this plate was used on the official car of the Mayor of Glamorgan, having been bequeathed to the County Council by Lady Boothby of Fonmon, the neice of the late former owner, Oliver Jones Esq. There's a photo of it on what looks like a mayoral Jaguar XJ6
here, along with another shot of it on an SLK.
Up to around 10 years ago, almost every borough or county council in the UK either owned or had the use of one or more very attractive plates for their mayoral and official cars, but with increased public awareness of the value of these plates, many have now either sold them or given them back to the DVLA to auctioned, often replacing them with Select Registrations. (eg: Bury Council gave back EN 1 and purchased T6 BUR for £250, while Essex famously sold F 1 for £375k.)
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JT 1
1964 - it was on a Volkswagen.
1969 - it was on a Fiat 600 in London.
1972 - listed as belonging to a Miss Jean Merrington in London, who was "definitely not interested in selling - at any price."
1988 - it was on a Rolls-Royce in London SW1.
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OO 7
1964 - was owned by a Mr Bernard Brooks in Gosfield, and was on a Jaguar E-Type. Seems he was issued with the plate by his local licensing authority in Essex. Mr Brooks commented on how much attention his plate had been attracting since the increased popularity of James Bond generated by the Cubby Broccoli films.
1969 - the number had passed to Belgravia-based Richard Jeffries, then heir to his father-in-law Richard Tompkins' Green Shield Stamp empire.
1972 - listed as part of the collection of GRF Tompkins. OO 7 and L 100 were both on Rolls-Royces, while OO 77 and OOO 7 were both on Aston Martins.
1988 - OO 7 was on a Rolls-Royce in Newbury.
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U 2
1964 - on a Rolls-Royce Silver Cloud owned by Mr Frank Lush, Finchley. He also owned MY 1, which he apparently gave to his friend, Wilfrid Reed.
By 1988, the plate had moved to Preston and the owner (who also had U 4 and U 6) wished to remain anonymous.
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NOT 1 /
BUT 2
1964 - NOT 1 belonged to a Mrs I Sharp in Odiham; BUT 2 belonged to holiday camp king Sir William 'Billy' Butlin, as did BUT 1.
1972 - NOT 1 is listed as belonging to the chairman of Lansing Bagnall in Basingstoke. BUT 1/BUT 2 had passed to Sir William's son, Robert.
By 1988, only BUT 1 was listed as belonging to the Butlin family, and NOT 1 has no details listed.
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PAR 1 /
1 PAR /
PAR 2 /
PAR 3 /
PAR 11
In 1988 these were all owned by Gordon Claridge of Berkhamstead, who had various business interests in Lowestoft. He died in the mid 1990s.