LEO III Installations

Note:
‘s’: – Standard machine.
Store speed 13.5 μsec

‘360’: – 360 machine.
Store speed 6.0 μsec’

326′: – 326 machine.
Store speed 2.6 μsec

Tape Decks

Machine Company Location Installed
Leo III/1  (s) Leo Computers Ltd,
Bureau machine
Hartree House
Queensway, London
1962 -1972
Leo III/2  (s) Leo Computers Pty Johannesburg, SA 1962 -1972
Leo III/3  (s) Dunlop Rubber Co. Ltd.
then to BOC
Birmingham 1962 -1966
Leo III/4  (s) London Boroughs Joint
Computer Committee
Greenwich 1963-1975
Leo III/5  (s) CAV Ltd. London 1963-1971
Leo III/6  (s) Shell-Mex & BP Ltd Hemel Hempstead / Manchester 1963-1972
Leo III/7  (s) J. Lyons & Co. Ltd. London 1963-1972
Leo III/8  (s) Tubemakers Pty. Ltd Sydney, Australia 1963-1976
Leo III/9  (s) HM Customs & Excise, Southend 1963-1974
Leo III/10  (s) Board of Trade Eastcote 1963-1971
Leo III/11  (s) Smith & Nephew Ltd Birmingham 1963-1970
Leo III/12 (326) Leo Computers Ltd,
(experimental 326 m/c.)
Minerva Road,
Acton
1963 -1967
Leo III/13  (s) BOC Ltd, Manchester 1964 -1975
Leo III/14  (s) Shell-Mex & BP Ltd. Hemel Hempstead /
Manchester
1964 -1972
Leo III/15  (s) Shell Australia Melbourne 1964-1969
Leo III/16  (s) Kayser Bondor Ltd. Baldock 1964-1971
Leo III/17  (s) Manchester Corporation Manchester 1963-1975
Leo III/18  (s) Cerebos Ltd.  then BOC London / Manchester 1964-1978
Leo III/19  (s) DNS (GPO)  then
London Boroughs MSU
Lytham St Annes
London
1964-1966
1967-1974
Leo III/20  (s) Colonial Mutual Life Melbourne, Australia 1964-1973
Leo III/21  (s) Tote Investors Ltd. London 1964-1973
Leo III/22  (s) H. J. Heinz & Co. Ltd.
then Renolds Chains
London
Manchester
1964-1971
1971-1975
Leo III/23 (360) Dunlop Rubber Co. Ltd,
then Freemans Ltd.
Birmingham
London
1965 -1971
1971-1973
Leo III/24  (s) Allied Suppliers Ltd., then
Phoenix Assurance Co.
London 1965 -1970
1970-1973
Leo III/25  (s) Inland Revenue Worthing 1965 -1974
Leo III/26 (326) NDPS (GPO) London 1965-1980
Leo III/27 (326) Freemans Ltd. Stockwell, London 1965-1975
Leo III/28  (s) Coventry Corporation Coventry 1965-1972
Leo III/29 (360) Shell Mex & BP Ltd. Manchester /
Hemel Hempstead
1965-1975
Leo III/30  (s) Royal Bank of Scotland Edinburgh 1965-1975
Leo III/31 (360) Shell Mex & BP Ltd. Hemel Hempstead 1965-1975
Leo III/32  (s) Colvilles Ltd (subsequently British Steel). Ravenscraig Steel Mill, Motherwell 1965-1974
Leo III/33  (s) Phoenix Assurance Co. Norbury, London 1965 -1973
Leo III/34 (326) NDPS (GPO) London 1965 -1977
Leo III/35  (s) South Western Gas Board Bath 1965 -1973
Leo III/36 (326) DNS (GPO) Lytham St Annes 1966-1975
Leo III/37  (s) British Insulated Callenders Cables Prescot 1965-1972
Leo III/38  (s) HM Dockyard Portsmouth / Rosyth 1965-1977
Leo III/39  (s) Ever Ready Co.
(was NDPS III/90)
London 1965-1973
Leo III/40  (s) Consolidated Glass Germiston, South Africa 1966-1973
Leo III/41 (360) NHKG Czechoslovakia 1966-1977
Leo III/42  (s) Renold Chains Ltd Manchester 1965-1974
Leo III/43 (360) HM Dockyard
(replaced LEO III/38)
Portsmouth 1966 -1977
Leo III/44 (326) NDPS (GPO) Cardiff & London 1966 -1981
Leo III/45  (s) Wedd Durlacher Mordaunt London 1966 -1972
Leo III/46 (326) J. Lyons & Co. Ltd,
then NDPS (GPO)
London 1966-1972
Leo III/47 (326) UDZ Czechoslovakia 1966-1980
Leo III/48  (s) HM Dockyards, Devonport 1966-1977
Leo III/49 (326) Shell Australia Melbourne 1966-1972
Leo III/51 (326) NDPS (GPO) Edinburgh & London 1966 -1981
Leo III/55 (326) NDPS (GPO) Portsmouth 1966 -1981
Leo III/56 (360) HM Dockyard Chatham 1967 -1977
Leo III/58 (326) NDPS (GPO) Derby 1966-1981
Leo III/66 (326) DNS (GPO), Glasgow & Bristol) 1969-1977
Leo III/67 (326) NDPS (GPO) Derby 1969 -1981
Leo III/68 (326) DNS (GPO), Glasgow & Edinburgh 1969 -1981
Leo III/69 (326) NDPS (GPO) London 1969 -1981
Leo III/70 (326) NDPS (GPO) Bristol 1969 -1981
Leo III/90  (s) NDPS (GPO) London 1964 -1965
Leo III/93 (360) VLD Czechoslovakia 1965-1979
Leo III/94  (s) London Boroughs Management Service Unit London 1967-1974
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