The Y Service 1939-1945

Huts and Blocks at Bletchley Park – brief details

This document may be useful when read in conjunction with the Bletchley Park Roll of Honour.It should not be considered definitive - it will not be kept updated and current use may change.

Full details of the wartime history of each hut and block can be found in History of Bletchley Park Huts and Blocks 1939 – 1945, available from the Bletchley Park shop.

Name

Dates

Occupants with Dates and comments

Hut 1

Early 1939 - present

Various uses, including bombe testing, fire station, Transport Office, and first aid post.

Hut 2

Aug 1939 - 1946

On what is now the Mansion car-park. Various uses, including NAAFI Refreshment Hut (1939 - 1954), lending library (1939 – 1942), language evening classes and emergency casualty clearing station.

Hut 3

Summer1940 – present

Close to Hut 6 German Army and Air Force Enigma Reporting Section (Jul 1940 – Feb 1943) Renumbered Hut 23 in Feb 1943.

Hut 4

Aug 1939 - present

Alongside the South side of the Mansion Naval Section (Aug 1939 – Mid 1942) Elements of Military Section, including Japanese, from Aug 1942 WT Coordination /CTR (Cover Traffic Records): From Jan 1944

Hut 5

Oct 1939 - 1945

Close to Hut 4Elements of Military Section, including Japanese and Balkans (Oct 1939 – 1945) Elements of Naval Section to Aug 1942. Cypher Operators Training School to Jan 1943 Medical Centre (Jun 1943 – late 1945) Security of Allied Cyphers Section from Nov 1944

Hut 6

Jan 1940 - present

Close to Hut 1, 3 and 8
German Army and Air Force Enigma Processing and Decryption Section (Jan 1940 – Feb 1943). Renumbered Hut 16 in Feb 1943.

Hut 7

May 1940 – post war.

Close to the end of Block B, near Block C
Hollerith Punched-Card Machine Section (May 1940 – Nov 1942). Half of Hut 7 retained for Hollerith operators training school when most machinery moved to Block C. Naval Section, cryptography (Nov 1942 - Jul 1943) Naval Section, Japanese Cryptography (NS IJ – Hugh Foss) (Jul 1943 – 1945)

Hut 8

Early 1940 - present

Alongside Hut 1, close to Hut 6 and to West of Block A
German Naval Enigma Processing and Decryption Section (Feb 1940 – Feb 1943) Renumbered Hut 18 in Mar 1943

Hut 9

Oct 1940 – post war

On what is now the Mansion car-park close to the tennis-courts
Mainly Administration Section. Other users included Naval Section and ISOS (Oct 1941 – Feb 1942).

Hut 10

Spring 1940 – present

Just to the East of Hut 3, alongside Hut 11.
Air Section (Spring 1940 – Aug 1942)
SIS Codes Section (Aug 1942 – Mar 1945)
Japanese Forces Section (JAFO) ) (Mar - Aug 1945)

Hut 11

Late 1940 - present

Complex of huts, close to and East of Hut 6.
Bombe operations, including control centre, training centre and administration (late 1941 – 1945).
Also used for testing Heath Robinson and Colossus.

Hut 12

Aug 1941- present

To North of Hut 3 until Aug 1942, moved to near site entrance.
Intelligence Exchange (Sep 1941 – Aug 1942)
Education Hut (Apr 1943 – 1945). Classes, concerts, religious services, and finally for Army resettlement courses from mid 1945.

Hut 14

Late 1941 – post war

Probably east/north-east of Hut 8, close to Blocks A & E
Communications Section. Housed at various times teleprinters, the Traffic and Cypher Office, Central Signals Registry
and Cover Traffic and Records Section.

Hut 15

Early 1941 - present

Collection of 4 Huts. close to the North of Hut 3 and Hut 10
SIXTA

Hut 16

Mar 1943 –present.

Renumbered from Hut 6, now known by its original number.
ISK (Mar 1943 –Sep 1943) Naval Section overflow (Sep 1943 – 1945)

Hut 18

Mar 1943 – present.

Renumbered from Hut 8, now known by its original number. ISOS (Mar 1943- Oct 1943) Naval Section Japanese Training School (Nov 1943- 1945)

Hut 23

Feb. 1943 -present

Renumbered from Hut 3, now known by its original number.
Various uses, including Photographic Section, Engineering Department and bombe technical support staff.

Block A

Jul 1942 - present

North of the Lake, running into the East end of Block B
Naval Section (Aug 1942 - 1945)
Air Section upper floor only (Aug 1942 – Jun 1943). Naval Section occupied both floors from Jun 1943.

Block B

Aug 1942 - present

North-East of the Lake, running into Block A Naval Section (Sep 1942 – 1945)

Block C

Nov. 1942 -present

North-East of the lake, across road beyond Block B
Hollerith Punched-Card Machine Section (Nov. 1942 – 1945).

Block D

Feb. 1943 -present

North of Blocks A, B, and EGerman Navy, Army and Air Force Enigma Processing and Decryption Section (Huts 3,6 and 8)(Feb 1943 – 1945)

Block E

Mar 1943 -present

Immediately North of Block A The Communications Centre (Feb 1943 – 1945). Cypher Office, Central Signals, Registry, Auto Room, Teleprinter Room.

Block F

Jul 1943 - 1987

East of Blocks E, D and G. Air Section (Sep 1943 – 1945) Newmanry (Nov 1943 - 1945) Testery (Sep 1943 – 1945) Military Section (May 1944 - 1945)

Block G

Oct 1943 - present

North of Block D and connected to it in places
ISK and ISOS (Oct 1943 – 1945) SIXTA (Oct 1943 – 1945) Military Section, German Police and Military Section Secretariat. Japanese Forces Section (JAFO) (1945)

Block H

Jun 1944 - present

East of southern wings of Block F
Newmanry – Colossus and Robinson operations (Sep 1944 – 1945)

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